feat(derive): Track Current Channel Size

[refcell]

Description

Adds a metric to kona-derive to track the number of frames in the current (top) channel.

[refcell]

• fix(examples): Reset Failed Payload Derivation Metric #338
• feat(derive): Frame Count -> Channels Histogram #337
• fix(derive): Pipeline Iterator #334
• feat(derive): Track Current Channel Size #331 👈
• fix(derive): Prefix Metric Names #330
• fix(examples): Graceful Payload Validation #327
• feat(derive): Additional Stage Metrics #326
• feat(derive): Granular Provider Metrics #325
• main

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 6.66667% with 14 lines in your changes missing coverage. Please review.

Project coverage is 77.7%. Comparing base (f1dedb5) to head (c8cb071).

Files	Patch %	Lines
crates/derive/src/stages/channel_bank.rs	11.1%	8 Missing ⚠️
crates/derive/src/types/channel.rs	0.0%	6 Missing ⚠️

Additional details and impacted files

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