initial schema draft

[roshaans]

Transaction Endpoint Schema

• This PR designs the API schema for the transactions api

Design Goals

• Scale access to near-indexer database.
• Create abstractions over indexer-database and nearcore concepts for devs to easily understand what is going on.
• Keep it consistent to the rest of the endpoints. PathParams style.
• Everything should be strong typed.

Dev link https://eapi-mainnet-vcqilefdcq-uc.a.run.app/#/paths/receipts/get

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