feat: implement a macro for trait transformations

[loichyan]

Add a macro, #[dynify], to free your hands from boilerplates when defining dyn traits. Currently, this macro is ready to use but requires further polishing. Documentation is absent at the moment, but I will add soon.

[codecov]

Codecov Report

❌ Patch coverage is 98.91008% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.19%. Comparing base (4182667) to head (93faa42).

Files with missing lines	Patch %	Lines
macros/src/dynify.rs	98.06%	3 Missing ⚠️
macros/src/lifetime.rs	99.28%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   97.75%   98.19%   +0.43%     
==========================================
  Files           6       12       +6     
  Lines         491      830     +339     
==========================================
+ Hits          480      815     +335     
- Misses         11       15       +4     

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