[Serialization] Removing flatbuffer/flexbuffer usage and library from BuildCC

[codecov[bot]]

Codecov Report

Base: 99.22% // Head: 99.31% // Increases project coverage by +0.09% :tada:

Coverage data is based on head (56b9a46) compared to base (2c2337e). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #226 +/- ## ========================================== + Coverage 99.22% 99.31% +0.09% ========================================== Files 73 73 Lines 2048 2039 -9 Branches 579 573 -6 ========================================== - Hits 2032 2025 -7 + Partials 16 14 -2 ``` | [Impacted Files](https://codecov.io/gh/coder137/build_in_cpp/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Niket+Naidu) | Coverage Δ | | |---|---|---| | [...uildcc/lib/target/src/generator/file\_generator.cpp](https://codecov.io/gh/coder137/build_in_cpp/pull/226/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Niket+Naidu#diff-YnVpbGRjYy9saWIvdGFyZ2V0L3NyYy9nZW5lcmF0b3IvZmlsZV9nZW5lcmF0b3IuY3Bw) | `100.00% <100.00%> (+4.17%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Niket+Naidu). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Niket+Naidu)

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