[Upstreaming] Added file-based SHM segment option in SHM module

.clang-format

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+---
+AccessModifierOffset: -1
+AlignEscapedNewlinesLeft: true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: true
+BasedOnStyle: Google
+BinPackParameters: false
+BreakBeforeBinaryOperators: false
+BreakBeforeBraces: Attach
+BreakConstructorInitializersBeforeComma: false
+ColumnLimit:     80
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+ExperimentalAutoDetectBinPacking: true
+IndentCaseLabels: false
+IndentFunctionDeclarationAfterType: false
+IndentWidth:     2
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCSpaceBeforeProtocolList: false
+PenaltyBreakBeforeFirstCallParameter: 10
+PenaltyBreakComment: 60
+PenaltyBreakFirstLessLess: 20
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+PointerAlignment: Left
+SpaceAfterControlStatementKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+Standard:        Cpp11
+TabWidth:        8
+UseTab:          Never
+...

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/general-question.md

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+---
+name: General Question
+about: General Questions about CacheLib usage, compilation, and anything else
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/workflows/build-cachelib-docker.yml

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+name: build-cachelib-docker
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build-cachelib-docker:
+    name: "CentOS/latest - Build CacheLib with all dependencies"
+    runs-on: ubuntu-latest
+    env:
+      REPO:           cachelib
+      GITHUB_REPO:    pmem/CacheLib
+      CONTAINER_REG:  ghcr.io/pmem/cachelib
+      CONTAINER_REG_USER:   ${{ secrets.GH_CR_USER }}
+      CONTAINER_REG_PASS:   ${{ secrets.GH_CR_PAT }}
+      FORCE_IMAGE_ACTION:   ${{ secrets.FORCE_IMAGE_ACTION }}
+      HOST_WORKDIR:         ${{ github.workspace }}
+      WORKDIR:              docker
+      IMG_VER:              main
+    strategy:
+      matrix:
+        CONFIG: ["OS=centos OS_VER=8streams PUSH_IMAGE=1"]
+    steps:
+      - name: "System Information"
+        run: |
+          echo === uname ===
+          uname -a
+          echo === /etc/os-release ===
+          cat /etc/os-release
+          echo === df -hl ===
+          df -hl
+          echo === free -h ===
+          free -h
+          echo === top ===
+          top -b -n1 -1 -Eg || timeout 1 top -b -n1
+          echo === env ===
+          env
+          echo === gcc -v ===
+          gcc -v
+      - name: "checkout sources"
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Pull the image or rebuild and push it
+        run: cd $WORKDIR && ${{ matrix.CONFIG }} ./pull-or-rebuild-image.sh $FORCE_IMAGE_ACTION
+
+      - name: Run the build
+        run: cd $WORKDIR && ${{ matrix.CONFIG }} ./build.sh

.github/workflows/clang-format-check.yml

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+# From: https://github.com/marketplace/actions/clang-format-check#multiple-paths
+name: clang-format Check
+on: [pull_request]
+jobs:
+  formatting-check:
+    name: Formatting Check
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        path:
+          - 'cachelib'
+          - 'examples'
+    steps:
+    - uses: actions/checkout@v2
+    - name: Run clang-format style check for C/C++ programs.
+      uses: jidicula/clang-format-action@v4.6.2
+      with:
+        clang-format-version: '13'
+        check-path: ${{ matrix.path }}