🎨 clarify LedgerError message when TAA is required and not accepted

[ff137]

Previously:

            if await self.is_ledger_read_only():
                raise LedgerError(
                    "Error cannot write cred def when ledger is in read only mode"
                )

is_ledger_read_only also checks to see if TAA is required, and if not accepted it will also report the ledger is read-only:

    async def is_ledger_read_only(self) -> bool:
        """Check if ledger is read-only including TAA."""
        if self.read_only:
            return self.read_only
        # if TAA is required and not accepted we should be in read-only mode
        taa = await self.get_txn_author_agreement()
        if taa["taa_required"]:
            taa_acceptance = await self.get_latest_txn_author_acceptance()
            if "mechanism" not in taa_acceptance:
                return True
        return self.read_only

To make this clearer to the user, I updated the relevant error messages to say TAA may also be the cause of the LedgerError.

e.g.:

                raise LedgerError(
                    "Error cannot write cred def when ledger is in read only mode, "
                    "or TAA is required and not accepted"
                )

[sonarcloud]

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