fix(styles): Fix for importing and handling project-stylesheet if only tokens are used.

[JayaKrishnaNamburu]

Currently tokens and Project StyleSheet are tightly coupled. Like tokens for css and css-modules are basically css-variables. Which works only when imported. But if a project is not using project-style-sheet at all. Then the tokens are not imported. So, need some extra checks and ways. So, if the project-style-sheet is not used. Then tokens are imported directly in the router of the project. Which is a entry point.

fixes #529

TODO

• Gatsby + CSS-Modules still needs a solution

[codecov]

Codecov Report

Merging #530 (115adf6) into development (8a23bcc) will decrease coverage by 0.37%.
The diff coverage is 71.67%.

@@               Coverage Diff               @@
##           development     #530      +/-   ##
===============================================
- Coverage        76.27%   75.90%   -0.38%     
===============================================
  Files              156      156              
  Lines             5698     5710      +12     
  Branches          1208     1227      +19     
===============================================
- Hits              4346     4334      -12     
- Misses            1291     1309      +18     
- Partials            61       67       +6     

Impacted Files	Coverage Δ
...ort-component-generator/src/assembly-line/index.ts	90.90% <0.00%> (-4.33%)	⬇️
...kages/teleport-project-generator-next/src/utils.ts	86.53% <ø> (-0.26%)	⬇️
packages/teleport-project-generator/src/utils.ts	81.30% <ø> (ø)
packages/teleport-plugin-react-jss/src/utils.ts	47.05% <20.00%> (-8.50%)	⬇️
...leport-plugin-react-styled-components/src/utils.ts	76.78% <20.00%> (-2.17%)	⬇️
...es/teleport-project-generator/src/file-handlers.ts	75.75% <40.00%> (-2.45%)	⬇️
packages/teleport-project-generator/src/index.ts	61.98% <40.00%> (-1.71%)	⬇️
packages/teleport-plugin-css/src/index.ts	83.33% <60.00%> (-1.29%)	⬇️
packages/teleport-plugin-css-modules/src/index.ts	90.29% <64.28%> (-3.65%)	⬇️
...-plugin-react-styled-components/src/style-sheet.ts	90.00% <70.00%> (-2.69%)	⬇️
... and 13 more

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[Utwo]

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