Change get_block_header_state for EOSJS support

[heifner]

eosjs

• https://github.com/eosnetworkfoundation/mandel-eosjs/blob/b61a88b4e88d0b3628c20128448b25a7cf1dbc3b/src/eosjs-api.ts#L375-L377

eosjs uses get_block_header_state for TAPOS. Modify get_block_header_state to only return the block header and id needed for eosjs. All other fields should provide some invalid value rather than the actual values to remove dependencies on the legacy block header state that goes away after the IF transition.

• https://github.com/eosnetworkfoundation/mandel-eosjs/blob/main/src/eosjs-serialize.ts#L1091-L1092 uses get_block_header_state

[ericpassmore]

Interface for BlockHeaderState is here.
https://github.com/eosnetworkfoundation/mandel-eosjs/blob/b61a88b4e88d0b3628c20128448b25a7cf1dbc3b/src/eosjs-rpc-interfaces.ts#L61-L76

[heifner]

Need to support this structure: https://github.com/eosnetworkfoundation/mandel-eosjs/blob/main/src/eosjs-rpc-interfaces.ts#L62

[ericpassmore]

Note:start
group: PROTOCOL
category: HTTP
summary: Update get_block_header_state to return valid values for required fields. This keeps backward compatibility with eosjs TAPOS.
Note:end