docs: Add time aware docs

[itsomri]

Description

This PR documents the time aware fairness feature in KAI.

Checklist

Note: Ensure your PR title follows the Conventional Commits format (e.g., feat(scheduler): add new feature)

• Self-reviewed
• Added/updated tests (if needed)
• Updated CHANGELOG.md (if needed)
• Updated documentation (if needed)

Breaking Changes

N/A

Additional Notes

N/A

[github-actions]

Merging this branch will decrease overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/NVIDIA/KAI-scheduler/pkg/apis/kai/v1	0.00% (ø)
github.com/NVIDIA/KAI-scheduler/pkg/operator/operands/scheduler	77.24% (-0.46%)	👎
github.com/NVIDIA/KAI-scheduler/pkg/scheduler/cache/usagedb/prometheus	18.18% (-0.97%)	👎

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/NVIDIA/KAI-scheduler/pkg/apis/kai/v1/schedulingshard_types.go	0.00% (ø)	5	0	5
github.com/NVIDIA/KAI-scheduler/pkg/apis/kai/v1/zz_generated.deepcopy.go	0.00% (ø)	265 (+7)	0	265 (+7)
github.com/NVIDIA/KAI-scheduler/pkg/operator/operands/scheduler/resources_for_shard.go	86.54% (-1.22%)	104 (+6)	90 (+4)	14 (+2)	👎
github.com/NVIDIA/KAI-scheduler/pkg/scheduler/cache/usagedb/prometheus/prometheus.go	18.18% (-0.97%)	99 (+5)	18	81 (+5)	👎

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/NVIDIA/KAI-scheduler/pkg/operator/operands/scheduler/resources_test.go

[enoodle]

I think that this PR should be split in 2 with one updating the docs and the other the code in pkg/