feat(schematics): dynamically install tslint-to-eslint-config as needed

[JamesHenry]

Refactors the internals of schematics to make a few improvements:

• tslint-to-eslint-config is no longer a static dependency of the schematics package, meaning that TSLint no longer is either, so users will no longer see warnings about it being deprecated as part of ng add

• Bumps the version and slightly expands the range of tslint-to-eslint-config (Fixes convert-tslint-to-eslint incorrectly converts no-parameter-reassignment to @typescript-eslint/no-param-reassign #344)

• when iterating through the files in the Tree as part of a conversion it now takes .gitignore data into account

[codecov]

Codecov Report

Merging #425 (ac48263) into master (da6bcf7) will decrease coverage by 1.51%.
The diff coverage is 63.33%.

@@            Coverage Diff             @@
##           master     #425      +/-   ##
==========================================
- Coverage   65.65%   64.14%   -1.52%     
==========================================
  Files          14       14              
  Lines         591      594       +3     
  Branches      113      118       +5     
==========================================
- Hits          388      381       -7     
- Misses        153      162       +9     
- Partials       50       51       +1     

Impacted Files	Coverage Δ
...nvert-tslint-to-eslint/convert-to-eslint-config.ts	50.00% <50.00%> (-6.25%)	⬇️
packages/schematics/src/utils.ts	70.40% <65.00%> (-2.78%)	⬇️
...s/schematics/src/convert-tslint-to-eslint/index.ts	46.55% <66.66%> (+0.35%)	⬆️
...matics/src/migrations/update-2-0-0/update-2-0-0.ts	96.77% <100.00%> (+4.66%)	⬆️
...matics/src/migrations/update-3-0-0/update-3-0-0.ts	90.00% <100.00%> (+3.63%)	⬆️

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit ac48263. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

Status	Command
	nx run-many --target=build --all --parallel
	nx run-many --target=check-configs --all --parallel
	nx run-many --target=test --all --parallel
	nx run-many --target=typecheck --all --parallel

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