[hft] Add aggregator CLI support

[Pterosaur]

What I did

Added HFT aggregator CLI support to config and show.

This PR adds:

• config hft add aggregator <name> with optional --reporting_rate, --rollover_counters, and --heatmap_counters.
• config hft del aggregator <name>.
• Deletion protection so an aggregator cannot be removed while any HFT profile still references it.
• config hft add profile <profile> --aggregator <name>.
• config hft bind-aggregator <profile> <aggregator> and config hft unbind-aggregator <profile>.
• show hft output for profile aggregator binding and aggregator details.
• Unit tests for config payload generation, delete protection, and show row formatting.

Why I did it

This exposes the HFT aggregator CONFIG_DB schema added by the HFT HLD and sonic-buildimage YANG updates.

How I verified it

Ran Python compile checks:

python -m py_compile config/hft.py show/hft.py tests/config_hft_test.py tests/show_hft_test.py

Ran targeted HFT CLI checks covering:

• config hft add aggregator payload generation.
• config hft bind-aggregator and unbind-aggregator payload generation.
• config hft del aggregator payload generation.
• Rejecting config hft del aggregator when an HFT profile still references the aggregator.
• show hft row formatting for bound and unbound aggregators.

Full pytest tests/config_hft_test.py tests/show_hft_test.py was not runnable in this Windows environment because the repository test conftest.py requires SONiC runtime packages (sonic_py_common, swsscommon, swsssdk) that are not installed locally.

Details if related

Related HLD PR: sonic-net/SONiC#2079.

[mssonicbld]

/azp run

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[Copilot]

Pull request overview

Adds CLI and display support for HFT “harmonizer” configuration, extending existing HFT profile/group management to include harmonizer creation, binding, and show hft rendering.

Changes:

• Add config hft commands to add/delete harmonizers and bind/unbind them to profiles, including delete protection when referenced.
• Extend show hft to display harmonizer binding and harmonizer attributes (reporting rate, rollover counters, heatmap counters), including unbound harmonizers.
• Update unit tests to validate harmonizer payload generation and show row formatting.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
config/hft.py	Adds harmonizer CRUD + bind/unbind CLI commands and payload builders, plus delete protection logic.
show/hft.py	Reads harmonizer table from CONFIG_DB and expands displayed columns/rows to include harmonizer details.
tests/config_hft_test.py	Adds/updates CLI unit tests for harmonizer payload generation and delete protection messaging.
tests/show_hft_test.py	Updates row-format expectations and adds coverage for bound/unbound harmonizer display formatting.

[mssonicbld]

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[mssonicbld]

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[mssonicbld]

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