PR Summary

• Introduction of a new verifyAddrsByAccount method to dotbit.md
  This update introduces a new functionality into the system. It allows verification to see if a given address possesses a specified SubDID under a certain account.

• Added verifyAddrsByAccount function in DotBit.ts
  We have expanded our code in DotBit.ts by implementing the verifyAddrsByAccount function. This function communicates with the subAccountVerify function in BitIndexer.ts to enable the address verification process mentioned above.

• Enabling address verification in BitIndexer.ts via subAccountVerify
  Following up on the last item, we introduced the subAccountVerify function in BitIndexer.ts. This function forms the backbone of the address verification process. It checks if an address holds a specified SubDID under a particular account.

• Testing the verifyAddrsByAccount function
  Finally, we've introduced tests for the verifyAddrsByAccount method in DotBit.test.ts. These tests ensure that the new function performs correctly and helps us maintain the reliability of our project.