feat(schematics): add add-eslint-to-project schematic

[JamesHenry]

This schematic will be required in v12 because there is no TSLint to convert OOTB.

[codecov]

Codecov Report

Merging #426 (0820217) into master (2c7e466) will increase coverage by 1.91%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##           master     #426      +/-   ##
==========================================
+ Coverage   64.14%   66.05%   +1.91%     
==========================================
  Files          14       15       +1     
  Lines         594      604      +10     
  Branches      118      120       +2     
==========================================
+ Hits          381      399      +18     
+ Misses        162      152      -10     
- Partials       51       53       +2     

Impacted Files	Coverage Δ
packages/schematics/src/utils.ts	75.37% <47.05%> (+4.97%)	⬆️
...s/schematics/src/convert-tslint-to-eslint/index.ts	47.90% <50.00%> (+1.35%)	⬆️
...ages/schematics/src/add-eslint-to-project/index.ts	75.00% <75.00%> (ø)

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 0820217. 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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Sent with 💌 from NxCloud.

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 0820217. 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

---

Sent with 💌 from NxCloud.