feat: add func logs command to stream function logs

[Itx-Psycho0]

This PR implements the func logs command requested in issue #3521.

The command provides a simple way to stream logs from deployed functions without needing to know the underlying service name or pod details.

Usage examples:

• Stream logs from current directory: func logs
• Stream logs by name: func logs --name my-function
• Filter by time: func logs --since 5m
• Custom namespace: func logs --namespace my-ns

Implementation details:

• Uses the existing GetKServiceLogs functionality from the knative package
• Supports graceful shutdown with Ctrl+C
• Includes comprehensive tests
• All tests and linting checks pass

The command is added to the Development Commands group alongside run, invoke, and build commands.

Fixes #3521

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow]

Hi @Itx-Psycho0. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Itx-Psycho0]

Hi @lkingland @jrangelramos,

I've implemented the func logs command as discussed in this issue. The implementation uses the Kubernetes logs API approach as suggested by @srikaryt2.

The command provides a clean interface for streaming function logs without requiring users to know service names or pod details. It supports filtering by time and works with both local functions and functions specified by name.

All tests pass and the implementation follows the existing command patterns in the codebase.

Looking forward to your feedback.

Thanks!

[codecov]

Codecov Report

❌ Patch coverage is 29.31034% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.66%. Comparing base (33a9d85) to head (c0bf31f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/logs.go	28.69%	80 Missing and 2 partials ⚠️

❗ There is a different number of reports uploaded between BASE (33a9d85) and HEAD (c0bf31f). Click for more details.

HEAD has 11 uploads less than BASE

Flag	BASE (33a9d85)	HEAD (c0bf31f)
e2e	3	2
unit windows-latest	1	0
e2e-config-ci	1	0
e2e springboot	1	0
e2e node	1	0
e2e typescript	1	0
e2e rust	1	0
integration	1	0
e2e quarkus	1	0
e2e python	1	0
e2e go	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3669      +/-   ##
==========================================
- Coverage   56.61%   47.66%   -8.95%     
==========================================
  Files         181      181              
  Lines       20853    20963     +110     
==========================================
- Hits        11806     9993    -1813     
- Misses       7833    10062    +2229     
+ Partials     1214      908     -306     

Flag	Coverage Δ
e2e	22.71% <29.31%> (-13.55%)	⬇️
e2e go	?
e2e node	?
e2e python	?
e2e quarkus	?
e2e rust	?
e2e springboot	?
e2e typescript	?
e2e-config-ci	?
integration	?
unit macos-14	44.58% <31.52%> (-0.08%)	⬇️
unit macos-latest	44.58% <31.52%> (-0.08%)	⬇️
unit ubuntu-24.04-arm	44.82% <29.31%> (-0.09%)	⬇️
unit ubuntu-latest	45.43% <31.52%> (-0.08%)	⬇️
unit windows-latest	?

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