* feat: implement an api to get all contracts which implement a given trait
* test: add test cases for contract/trait endpoint
* docs: added docs for contract/trait endpoint
* fix: add return statment after response
* perf: add index for jsonb abi column
* refactor: use createIndex method
* fix: use get request instead of post for contracts trait
* docs: update docs for trait/contract api
* fix: fixed rebase issue
* test: add test for large query data
* refactor: change path of contract/by_trait api