Automate Integration Tests

[amab8901]

Solves: https://worldmobile.atlassian.net/browse/EN-505

Description:

• Implement integration tests (tests/mock.rs) for the endpoints in src/server/handler/handler_rest/info.rs
• Simplify repetitive code into a function (data_provider()) in info.rs and dbsync/api.rs
• Correct inaccurate/confusing descriptions/names in info.rs (for example script_utxos -> get_address_utxos, utxos_per_addr -> get_address_utxos)
• Make functions in dbsync/api.rs more easily debugged
• Replace return value Vec<u8> with String
• Expose all endpoints that weren't previously exposed (token_supply, mint_metadata_policy_assetname)
• Delete redundant endpoints (retrieve_active_pools_all_pages, pool_reward_address)
• Renamed duplicate tag names so that one endpoint can be run without simultaneously running another endpoint (example: Mint Metadata -> Mint Metadata Policy Assetname)
• Fix mint_metadata endpoint (it previously failed tests because it encoded all byte arrays to hex without first trying to encode to utf8)