Add configurable namespace to telemetry

[ljoss17]

Closes: #4380

Description

This PR adds a new optional configuration, prefix for the telemetry.
When this is set to something other than an empty string this will make all the metrics prefixed with the configured value.

E.g prefix = "hermes":

hermes_acknowledgement_events_total{chain="ibc-0",channel="channel-0",counterparty="ibc-1",port="transfer",otel_scope_name="hermes"} 3
hermes_send_packet_events_total{chain="ibc-0",channel="channel-0",counterparty="ibc-1",port="transfer",otel_scope_name="hermes"} 3

E.g prefix = "" or prefix not set:

acknowledgement_events_total{chain="ibc-0",channel="channel-0",counterparty="ibc-1",port="transfer",otel_scope_name="hermes"} 3
send_packet_events_total{chain="ibc-0",channel="channel-0",counterparty="ibc-1",port="transfer",otel_scope_name="hermes"} 3

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests: integration (for Hermes) or unit/mock tests (for modules).
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[adizere]

an operator should ideally test this