[cli] Add vercel pull command

[jaredpalmer]

Add vercel pull command. Closes https://github.com/vercel/runtimes/issues/142.

It does the following:

• Pull the .env file (it calls pull internally)
• Adds the following to .vercel/project.json (which will then be used by vercel build):

  interface ProjectLink {
       projectId: string
       orgId: string
       settings: {
         buildCommand: string | null,
         devCommand:  string | null,
         directoryListing:  string | null,
         outputDirectory:  string | null,
         rootDirectory:  string | null,
         framework: string | null,
       }
   }

This PR also deprecates vc env pull with a warning:

📋 Checklist

• Help output
• Flags (need to combine flags from env pull)

Tests

• The code changed/added as part of this PR has been covered with tests
• All tests pass locally with yarn test-unit

Code Review

• This PR has a concise title and thorough description useful to a reviewer
• Issue from task tracker has a link to this PR

[codecov]

Codecov Report

Merging #6822 (6821953) into main (9e16ce7) will decrease coverage by 5.77%.
The diff coverage is 89.10%.

❗ Current head 6821953 differs from pull request most recent head f84d43e. Consider uploading reports for the commit f84d43e to get more accurate results

@@            Coverage Diff             @@
##             main    #6822      +/-   ##
==========================================
- Coverage   55.03%   49.26%   -5.78%     
==========================================
  Files          85      126      +41     
  Lines        3594     4882    +1288     
  Branches      830     1166     +336     
==========================================
+ Hits         1978     2405     +427     
- Misses       1610     2466     +856     
- Partials        6       11       +5     

Impacted Files	Coverage Δ
packages/cli/test/mocks/client.ts	88.88% <ø> (ø)
packages/cli/src/commands/pull.ts	80.00% <80.00%> (ø)
packages/cli/test/mocks/team.ts	90.00% <90.00%> (ø)
packages/cli/test/mocks/project.ts	90.90% <90.90%> (ø)
packages/cli/test/helpers/setup-fixture.ts	95.83% <95.83%> (ø)
packages/cli/src/commands/env/pull.ts	76.66% <100.00%> (ø)
...es/cli/src/util/projects/write-project-settings.ts	100.00% <100.00%> (ø)
packages/cli/test/mocks/user.ts	100.00% <100.00%> (ø)
packages/cli/src/util/validate-paths.ts	24.39% <0.00%> (ø)
packages/cli/src/util/input/select-org.ts	85.71% <0.00%> (ø)
... and 39 more

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[styfle]

Thanks! 🎉

Remember to update the docs to add deprecation notes as well as the new command here: https://vercel.com/docs/cli