feat(cli): control library init version with a command-line parameter

[rix0rrr]

Allows controlling of the cdk init version of aws-cdk-lib:

cdk init --lib-version=1.2.3 

Mainly intended to be used by tests (to smoke-test that upcoming library versions still init properly), but it can be used by users as well.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.00000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 84.53%. Comparing base (5b3afbe) to head (3b85471).

Files with missing lines	Patch %	Lines
...es/aws-cdk/lib/cli/parse-command-line-arguments.ts	0.00%	6 Missing ⚠️
packages/aws-cdk/lib/cli/convert-to-user-input.ts	0.00%	2 Missing ⚠️
packages/aws-cdk/lib/cli/cli.ts	0.00%	1 Missing ⚠️
packages/aws-cdk/lib/init.ts	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
- Coverage   84.80%   84.53%   -0.27%     
==========================================
  Files         198      198              
  Lines       35380    35400      +20     
  Branches     4572     4542      -30     
==========================================
- Hits        30003    29926      -77     
- Misses       5232     5329      +97     
  Partials      145      145              

Flag	Coverage Δ
suite.unit	84.53% <60.00%> (-0.27%)	⬇️

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[mrgrain]

Should we just make this a cli feature? E.g. cdk init app --l typescript --version 2.123.0

[rix0rrr]

Should we just make this a cli feature

Fair! Yeah, why not