Fix theme proxy generation performance issue

[YoussefHenna]

• After some trial and error testing in this PR and Performance tests #969, was able to pinpoint the issue to zod not being performant enough to use in the proxy generation logic (which is called everytime a theme value is used)
• This PR keeps zod for the initial validation only (as it was intended to be used) and uses simpler util functions in the theme value proxy generation.

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Important

Improves theme proxy generation performance by replacing zod with utility functions for runtime checks, retaining zod for initial validation.

• Performance Improvement:
  • Replaces zod with utility functions isTextStyleObject and asThemeValuesObject in createThemeValuesProxy.ts for runtime checks.
  • Keeps zod for initial validation in validators.ts.
• Refactoring:
  • Moves isTextStyleObject and asThemeValuesObject from validators.ts to utils.ts.
• Dependencies:
  • Adds lodash.isobject to package.json for object checks.

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[linear]

P-5705 Super lag after recent published application

[github-actions]

Published version: @draftbit/[email protected]

[github-actions]

Published version: @draftbit/[email protected]

[github-actions]

Published version: @draftbit/[email protected]

[github-actions]

Published version: @draftbit/[email protected]

[github-actions]

Published version: @draftbit/[email protected]

[github-actions]

Published version: @draftbit/[email protected]

[github-actions]

Published version: @draftbit/[email protected]