refactor(download): Rename dl() to Invoke-Download()

[examosa]

Description

This PR renames the dl and related functions to use more descriptive names that better adhere to PowerShell conventions.

Motivation and Context

Resolves #3830

How Has This Been Tested?

Test suite run on local machine and in CI; all remain passing.

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.

[rashil2000]

I think Invoke-Download is good enough (web is implied)

[examosa]

Thanks for the feedback @niheaven. I have a few clarifying questions:

1. It looks like you're suggesting to remove Invoke-WebDownload and use Invoke-WebRequest directly. Will it be alright to omit the headers from the original code and the -UseBasicParsing flag (PowerShell 5 compatibility)?
2. Based on the suggested changes to string quotes, would it be alright if I updated the VS Code workspace settings like so?

@@ -4,6 +4,7 @@
     "powershell.codeFormatting.preset": "OTBS",
     "powershell.codeFormatting.alignPropertyValuePairs": true,
     "powershell.codeFormatting.ignoreOneLineBlock": true,
+    "powershell.codeFormatting.useConstantStrings": true,
     "files.exclude": {
         "**/.git": true,
         "**/.svn": true,

[niheaven]

1. It looks like you're suggesting to remove Invoke-WebDownload and use Invoke-WebRequest directly. Will it be alright to omit the headers from the original code and the -UseBasicParsing flag (PowerShell 5 compatibility)?

Yes, it should, but in fact this file is no longer used. Now installer script is here in https://github.com/ScoopInstaller/Install.

2. Based on the suggested changes to string quotes, would it be alright if I updated the VS Code workspace settings like so?

@@ -4,6 +4,7 @@
     "powershell.codeFormatting.preset": "OTBS",
     "powershell.codeFormatting.alignPropertyValuePairs": true,
     "powershell.codeFormatting.ignoreOneLineBlock": true,
+    "powershell.codeFormatting.useConstantStrings": true,
     "files.exclude": {
         "**/.git": true,
         "**/.svn": true,

Yes, it is, and we usually use the following setting too:

"powershell.codeFormatting.useCorrectCasing": true

[rashil2000]

@examosa Can you make a corresponding PR to GithubActions too? Otherwise the actions will break when this feature gets released.