add hr and reports command groups

[sumedhkane03]

Summary

• add new top-level hr and reports command groups using existing authenticated API client patterns
• implement employee directory, time-off, payroll, and reports list/run/export command flows with guarded fallback endpoint handling
• fix CLI entrypoint registration so poetry run rippling ... includes all registered commands, and add CliRunner tests + README usage docs

Test plan

• poetry run pytest
• poetry run rippling -h
• poetry run rippling hr -h
• poetry run rippling reports -h

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Note

Medium Risk
Adds new command surfaces that call authenticated internal endpoints and write export files, so incorrect endpoint selection/response handling could cause runtime errors or unexpected output, though changes are isolated to new modules and include basic tests.

Overview
Adds new top-level rippling hr and rippling reports command groups, including HR employee directory (list/get), time-off and payroll summary queries, and report list/run/export workflows with basic output formatting.

Introduces hr_reports_utils helpers to build an authenticated API client (optionally with role/company headers), parse JSON params, and try multiple candidate internal endpoints with graceful fallback when an org lacks access.

Updates CLI startup to register commands at import time (so poetry run rippling ... exposes all commands), adds CliRunner tests covering help text and key error/success paths, and expands README.md with usage examples and testing instructions.

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