feat: otel metrics for messenger

[gk-kindred]

This change introduces Otel metrics for talos messenger

Type of metric	metric name	metric description
Gauge	talos_messenger_suffix_length	Suffix Length
Gauge	talos_messenger_suffix_head	Suffix Head
Gauge	talos_messenger_actions_channel_capacity	Action Channel size
Gauge	talos_messenger_feedback_channel_capacity	Feedback Channel size
Counter	talos_messenger_candidates_processed	Suffix Item Completion reason
Counter	talos_messenger_errors(error_type=deserialise_message)	Error - Deserialising payload
Counter	talos_messenger_errors(error_type=publish_message)	Error - Publishing message
Histogram	talos_messenger_candidate_received_publish_action	Candidate received to Messenger on_commit publish
Histogram	talos_messenger_decision_received_publish_action	Decision received to Messenger on_commit publish
Histogram	talos_messenger_decision_received_pick_action	Decision received to Messenger picked on_commit messages
Histogram	talos_messenger_action_picked_published	on_commit message picked to published(Picked in Inbound Service and passed to Action Service from where it will be published)
Histogram	talos_initiator_messenger_publish_action	Initiator to on_commit message published

[codecov]

Codecov Report

❌ Patch coverage is 83.60656% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.09%. Comparing base (5863d8c) to head (de56816).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...kages/talos_messenger_actions/src/kafka/service.rs	83.33%	26 Missing ⚠️
...alos_messenger_actions/src/messenger_with_kafka.rs	0.00%	12 Missing ⚠️
...ackages/talos_messenger_actions/src/kafka/utils.rs	97.77%	1 Missing ⚠️
...los_messenger_core/src/services/inbound_service.rs	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   66.52%   67.09%   +0.56%     
==========================================
  Files         124      124              
  Lines       12195    12391     +196     
==========================================
+ Hits         8113     8314     +201     
+ Misses       4082     4077       -5     

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