mirrornode monitor: add support for free queries

[beeradb]

Problem

The mirrornode monitor has the capability to send transactions to a target network and generate metrics from those results. Currently, all of the supported transaction types reach consensus, and thus, the transaction has a cost in hbar.

From the perspective of using this component to monitor network status, it would be helpful to support node queries such as account balance queries.

Solution

Add support for one or more free query types, such as account balance queries.

This would allow operators to send more frequent requests to nodes for monitoring purposes while controlling the amount of hbar the monitor uses. The result would be the ability to increase resolution on the metrics the monitor provides while still maintaining the ability to confirm transactions from end-to-end using the mirrornode.

Alternatives

No response