Add AreTheTypesWrong CLI to continuously validate package types (#1083)

* Add AreTheTypesWrong (attw) CLI to continuously validate package types

Added the dependency, update script/CI to run attw.

Also, add Licensee exception for the package `(at)andrewbranch/untar.js`
which does not specify its license in its manifest but has a LICENSE
file specifying the (already approved) MIT license.

* Create type declarations for "shescape/testing" module

Create a new `.d.ts` file with type declarations for the module
"shescape/testing". Following the module name `testing.js`, this
declaration file is called `testing.d.ts`. Like `index.d.ts` it's a
collection of manually maintained type definitions for the exports of
the module it represents. The export details in the project manifest
have been updated accordingly, so has the `.npmignore` allowlist.

Furthermore, other configuration files have been updated in accordance
with this change. The "generated" `.d.cts` file should be properly
ignored and cleaned up.

* Update the changelog

.eslintrc.yml

@@ -742,3 +742,4 @@ ignorePatterns:
   - index.cjs
   - index.d.cts
   - testing.cjs
+  - testing.d.cts

.gitignore

@@ -8,6 +8,7 @@ crash-*
 index.cjs
 index.d.cts
 testing.cjs
+testing.d.cts
 
 # ESLint
 .eslintcache

.licensee.json

@@ -16,6 +16,7 @@
     ]
   },
   "packages": {
+    "@andrewbranch/untar.js": "1.0.2",
     "deep-freeze": "0.0.1",
     "filter-iterator": "0.0.1",
     "identity-function": "1.0.0"

.npmignore

@@ -14,4 +14,6 @@
 !README.md
 !SECURITY.md
 !testing.cjs
+!testing.d.cts
+!testing.d.ts
 !testing.js

CHANGELOG.md

@@ -7,6 +7,7 @@ Versioning].
 
 ## [Unreleased]
 
+- Fix TypeScript type declarations for `"shescape/testing"`. ([#1083])
 - Fix TypeScript type exports for CommonJS use. ([#1082])
 
 ## [1.7.2] - 2023-07-07
@@ -283,6 +284,7 @@ Versioning].
 [#1022]: https://github.com/ericcornelissen/shescape/pull/1022
 [#1023]: https://github.com/ericcornelissen/shescape/pull/1023
 [#1082]: https://github.com/ericcornelissen/shescape/pull/1082
+[#1083]: https://github.com/ericcornelissen/shescape/pull/1083
 [552e8ea]: https://github.com/ericcornelissen/shescape/commit/552e8eab56861720b1d4e5474fb65741643358f9
 [keep a changelog]: https://keepachangelog.com/en/1.0.0/
 [semantic versioning]: https://semver.org/spec/v2.0.0.html