Reimplement json-bigint

[janek26]

One of our dependencies https://github.com/sidorares/json-bigint has seen it's best days.
It uses bignumber.js as a dependency, while this library uses bn.js. It also supports native BigInt which breaks support for older browsers and browserslists (see #37 ).

Lets reimplement this package in TS.
As a starting point we can use the test suites provided at the original repo and write an implementation against it.

We can ether make this repo a monorepo or start a new repo.

Acceptance Criteria

• no use of native BigInt
• use BN.js as only dependency
• passes all test from the original repo

[wraitii]

FYI I'm hitting this issue with json-bigint when using starknet.js .
My temp fix is to pull from git+https://github.com/bushev/json-bigint.git#e3e93f71d633cd558bc7c57afcd9e1f54f669d0b in my package.json

[janek26]

on hold.
Maybe Starkware moves to using hex everywhere in compiled contracts which would solve this and remove the bitint json dependency

[ivpavici]

Closed with #560, if something is missing please reopen :)