port Rust version from original repo: https://github.com/XuJiandong/moleculec-c2

Including fuzzing tests

add corpus

Use quote instead of printing code in generator

* Support iterator
* Change read_at as method
* sub_size returns Result
* Check alignment on get_item_count
* Snake names
* Some typos

* Add verify methods
* Add iterator test cases
* Make lazy_reader.rs panic free
* Add impl_cursor_primitive
* Format error strings

Add test cases

* support custom unicode id
* Array get item return Vec<u8>
* union uses Enum

Fix typo

* Refactor errors
Remove strings because it takes more space in contracts.
* Check read_len == 0 on lazy_reader.rs: read_at
* Add test case for zero byte union
* Add clone
* fix length on read
* add slice_by_start

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Co-authored-by: joii2020 <87224197+joii2020@users.noreply.github.com>