feat: Add support for 'projectName' setting (#2107)

[apburgess]

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• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
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• Tests for the changes are included.

What is the current behavior?

Currently the files generated during the build process take the project name from the basename of the directory the project is contained in.

What is the new behavior?

If (and only if) the new 'projectName' setting is present in the nativescript.config.ts file, the name specified there is used instead of the basename of the project directory.

Fixes/Implements/Closes #2107
(Note on iOS this requires an additional patch to @nativescript/webpack5 that will be linked below)

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[apburgess]

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[apburgess]

Linked to PRs NativeScript/NativeScript#10550 and NativeScript/docs#143.