feat: cmperf should parse counter cook type

[cgrinds]

No description provided.

[Copilot]

Pull request overview

Adds support in the cmperf cmmetrics parser for schema fields related to counter “cook” behavior, making parsed counter schemas more expressive and enabling consumers to understand derived counters.

Changes:

• Introduced a dedicated CounterTypeEnum (cook type) for CounterSchema.Type instead of using a raw uint8.
• Added parsing/storage of base_counter_index into CounterSchema.BaseIndex.
• Updated tests to assert cook type semantics and base index parsing from the sample protobuf data.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
cmd/collectors/cmperf/cmmetrics/metrics.go	Adds cook-type enum, extends CounterSchema, and parses base_counter_index from schema payloads.
cmd/collectors/cmperf/cmmetrics/metrics_test.go	Updates assertions to validate enum cook types and newly parsed base index.

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