feat!: prefer forge.config.js over package.json config

[erickzhao]

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

This change affects the init and import commands. It changes these commands to create a forge.config.js rather than creating config.forge in your package.json.

This is considered a breaking change for any third-party templates because the base template no longer sets up a config.forge object, and any template-specific mutations to the Forge config should instead be performed on the forge.config.js file.

Ref #2973

[codecov]

Codecov Report

Merging #2991 (05c423b) into main (1472149) will increase coverage by 0.14%.
The diff coverage is 82.00%.

@@            Coverage Diff             @@
##             main    #2991      +/-   ##
==========================================
+ Coverage   73.80%   73.94%   +0.14%     
==========================================
  Files          67       68       +1     
  Lines        2168     2180      +12     
  Branches      436      434       -2     
==========================================
+ Hits         1600     1612      +12     
- Misses        361      362       +1     
+ Partials      207      206       -1     

Impacted Files	Coverage Δ
packages/api/core/src/api/import.ts	62.74% <56.25%> (+0.98%)	⬆️
packages/api/core/src/util/forge-config.ts	80.00% <66.66%> (-0.60%)	⬇️
packages/api/core/src/api/init-scripts/init-git.ts	92.30% <100.00%> (ø)
packages/api/core/src/api/init.ts	91.89% <100.00%> (+0.22%)	⬆️
packages/template/base/src/BaseTemplate.ts	97.72% <100.00%> (ø)
packages/template/base/tmpl/forge.config.js	100.00% <100.00%> (ø)
...ypescript-webpack/src/TypeScriptWebpackTemplate.ts	100.00% <100.00%> (ø)
packages/template/webpack/src/WebpackTemplate.ts	100.00% <100.00%> (ø)

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