feat: update crate architecture

[ya7on]

Summary of changes:

Allow to use custom parsers and builders

[codecov]

Codecov Report

Attention: Patch coverage is 73.04965% with 38 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/libs/tonlib_core.rs	74.73%	24 Missing ⚠️
src/types/optional.rs	0.00%	9 Missing ⚠️
src/types/string.rs	0.00%	5 Missing ⚠️

Files with missing lines	Coverage Δ
src/common.rs	100.00% <100.00%> (ø)
src/types/address.rs	81.25% <100.00%> (-18.75%)	⬇️
src/types/bool.rs	100.00% <100.00%> (ø)
src/types/coins.rs	100.00% <100.00%> (ø)
src/types/int.rs	100.00% <100.00%> (ø)
src/types/uint.rs	100.00% <100.00%> (ø)
src/types/string.rs	0.00% <0.00%> (-97.78%)	⬇️
src/types/optional.rs	0.00% <0.00%> (-100.00%)	⬇️
src/libs/tonlib_core.rs	74.73% <74.73%> (ø)

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