bfgapi: add pagination to pop-txs-for-l2-block

[joshuasing]

Confirmation

• I have checked for similar issues.

Problem

The pop-txs-for-l2-block response becomes large when there is a lot of active PoP Miners broadcasting transactions.

Suggested solution

I think we should add pagination to the pop-txs-for-l2-block request/response, so that BSS can request the all of the transactions in several requests. This should make this a lot more table, while reducing the overall size of each response, preventing us from exceeding the read limit.

Additional Information

No response