[HORIZONDB] az horizondb create | show | delete: Introduce commands for Azure HorizonDB

[nasc17]

Related command
az horizondb create
az horizondb show
az horizondb get

Description
Onboarding Horizon DB commands for public preview.
#33267

Testing Guide
Manual

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change
[Component Name 2] az command b: Add some customer-facing feature

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[Copilot]

Pull request overview

This PR onboards a new first-party Azure CLI command module for Azure HorizonDB (Microsoft.HorizonDb) as a public preview feature, including packaging, command registration, help, and live tests/recordings.

Changes:

• Add the horizondb command module with az horizondb create | show | delete command surface, argument definitions, client factory, and help.
• Register the module in the CLI command index, docs source map, live test pipeline config, and CODEOWNERS.
• Add scenario tests and recordings for cluster create/show/delete, plus dependency pinning for azure-mgmt-horizondb.

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/azure-cli/setup.py	Add azure-mgmt-horizondb dependency to CLI packaging.
src/azure-cli/requirements.py3.windows.txt	Pin azure-mgmt-horizondb for Windows builds.
src/azure-cli/requirements.py3.Linux.txt	Pin azure-mgmt-horizondb for Linux builds.
src/azure-cli/requirements.py3.Darwin.txt	Pin azure-mgmt-horizondb for macOS builds.
src/azure-cli/azure/cli/command_modules/horizondb/init.py	New commands loader wiring for HorizonDB module.
src/azure-cli/azure/cli/command_modules/horizondb/_client_factory.py	Management client factory for HorizonDB SDK.
src/azure-cli/azure/cli/command_modules/horizondb/_params.py	Argument definitions for horizondb commands.
src/azure-cli/azure/cli/command_modules/horizondb/_help.py	CLI help + examples for horizondb group/commands.
src/azure-cli/azure/cli/command_modules/horizondb/cluster_commands.py	Command table registration for create/show/delete.
src/azure-cli/azure/cli/command_modules/horizondb/commands/custom_commands.py	Custom implementations for create/delete/list.
src/azure-cli/azure/cli/command_modules/horizondb/utils/_transformers.py	Table output transformers for HorizonDB.
src/azure-cli/azure/cli/command_modules/horizondb/utils/_context.py	Custom argument context (AAZ-style expand) hook.
src/azure-cli/azure/cli/command_modules/horizondb/utils/validators.py	Validators (password prompting / tag validation).
src/azure-cli/azure/cli/command_modules/horizondb/randomname/*	Random username generator + word lists.
src/azure-cli/azure/cli/command_modules/horizondb/tests/latest/test_horizondb_commands.py	New scenario test for cluster mgmt.
src/azure-cli/azure/cli/command_modules/horizondb/tests/latest/recordings/test_horizondb_cluster_mgmt.yaml	Recording for the new scenario test.
src/azure-cli/azure/cli/command_modules/horizondb/tests/latest/constants.py	Test constants (location, naming).
src/azure-cli/azure/cli/command_modules/horizondb/tests/init.py	Test package init.
src/azure-cli/azure/cli/command_modules/horizondb/tests/latest/init.py	Latest test package init.
src/azure-cli/azure/cli/command_modules/horizondb/utils/init.py	Utils package init.
src/azure-cli/azure/cli/command_modules/horizondb/commands/init.py	Commands package init.
src/azure-cli/azure/cli/command_modules/horizondb/randomname/init.py	Randomname package init.
src/azure-cli-core/azure/cli/core/profiles/_shared.py	Add ResourceType.MGMT_HORIZONDB.
src/azure-cli-core/azure/cli/core/commandIndex.latest.json	Register horizondb module for command loading.
scripts/live_test/CLITest.yml	Include horizondb in live test matrix.
doc/sphinx/azhelpgen/doc_source_map.json	Register help source for horizondb.
.github/CODEOWNERS	Add code owners for the new command module path.

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[Copilot]

table_transform_output expects keys like 'primary endpoint', 'username', and 'password' to exist in the command result. The HorizonDB create/show responses are standard ARM resources (e.g., name, location, properties.*) and don't include these keys, so az horizondb create -o table will raise a KeyError. Update the table transformer (or the create command output shaping) to match the actual response fields (e.g., FQDN/readonly endpoint/version/vCores/replicaCount) and guard against missing keys.