Add --debug global flag

[romac]

Summary

Add a --debug flag which can either be be repeated (--debug=rpc --debug=profiling) or take a comma-separated list of sections to enable debugging for (--debug=rpc,profiling), or a combination of the two.

The former is easier to use when invoking Hermes from scripts etc, while the latter is shorted to type when invoked manually.

rpc

Passing --debug=rpc to Hermes has the effect of printing out the outgoing and incoming RPC requests, having the same effect as setting tendermint_rpc=debug to the tracing filter.

profiling

Passing --debug=profiling to Hermes which enables the profiling output.

Problem Definition

It's easier to instruct users to add a flag to their Hermes command rather than ask them to set an esoteric variable to a cryptic value.

Proposal

As above.

Acceptance Criteria

Hermes can take a global --debug flag which can take the rpc value and print out the incoming and outgoing RPC requests.

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