feat: search in more than one namespace

[matheusandre1]

Closes: #18

[Copilot]

Pull request overview

Adds support for searching logs across multiple Kubernetes namespaces by allowing the --namespace/-n flag to accept a comma-separated list.

Changes:

• Update logs command to split --namespace into multiple namespaces and aggregate results.
• Export Grepper.SortMessages and use it to re-sort combined results across namespaces.
• Add/adjust tests for the new sort method and multi-namespace flag parsing.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
cmd/logs.go	Split comma-separated namespaces, loop over them, aggregate results, and re-sort when multiple namespaces are provided.
internal/log/log_grepper.go	Export SortMessages (was sortMessages) and update Grep to call it.
internal/log/log_grepper_test.go	Update existing sort test to use SortMessages and add a new test covering sort modes.
cmd/cmd_test.go	Add a CLI test intended to validate multi-namespace flag syntax.

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