Allow more granular configuration of Hermes modes of operation

[ancazamfir]

Crate

relayer

Summary

Allow more granular configuration of hermes client operation.
[cc @mankenavenkatesh]

Problem Definition

[Principal problem is described in #1489. This issue is a first step over one track towards fixing #1489. There will be others, e.g. migration to async, that will deal with performance.]

• client misbehaviour worker impacts performance of the packet relaying
• there are applications that require live packets to be relayed in real-time while old packets can be left to timeout, clear at a later stage, etc. An example is injective chains that send requests periodically to get token pricing information

Proposal

Allow the user to specify at a lower granularity the mode of operation for a given instance. For this issue we want to be able to specify if client workers should run misbehaviour and/or periodic client refresh.
After an initial discussion with @romac and @adizere, the proposal here is that we take this opportunity and remove strategy and add new configuration section mode (or something else). We also add a clients and packets sections to the configuration.
Ideally the config will be changed to something like:

[global]
log_level = 'info'

[mode]

[mode.clients]
enabled = true
refresh = true
misbehaviour = true

[mode.connections]
enabled = false

[mode.channels]
enabled = false

[mode.packets]
enabled = true
clear_interval = 100
clear_on_start = true 
filter = false
tx_confirmation = true

[rest]
...

[telemetry]
...

• for example hermes instance that runs refresh and misbehavior only

[mode]

[mode.clients]
enabled = true
refresh = true
misbehaviour = true

[mode.connections]
enabled = false

[mode.channels]
enabled = false

[mode.packets]
enabled = false

Acceptance Criteria

Ability to disable client misbehavior.
Ability to not clear packets on start.

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