Add etherscan_api bash function for Etherscan API v2 POST requests

[Copilot]

Adds a bash convenience function for making POST requests to Etherscan API v2 endpoint.

Changes

• .bashrc: New etherscan_api() function wrapping curl --request POST --url https://api.etherscan.io/v2/api
• BASHRC.md: Documentation with usage examples

Usage

source .bashrc

# JSON request
etherscan_api -H 'Content-Type: application/json' -d '{"module":"contract","action":"getabi","address":"0x..."}'

# Form-encoded with API key
etherscan_api -d 'chainid=2201&module=contract&action=getsourcecode&address=0x...&apikey=YOUR_API_KEY'

Function accepts any curl options via passthrough.

Original prompt

curl --request POST
--url https://api.etherscan.io/v2/api

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