fix: restore function-parameters.json generation for ListFunctionParameters

[k-grube]

ListFunctionParameters?Module=CIPPCore currently times out due to generating help text from Get-Help on every function in CIPPCore, which makes it so you can't use the scheduler form because this field is always fetching

This PR restores the Tools/Build-FunctionParameters.ps1 script with some improvements

Changes from the original:

• generates the cache in ~1s vs 3 minutes, AST parse instead of importing the module and running Get-Help
• functions without comment help get a synthesized syntax-line synopsis, byte-identical to what Get-Help produced (scheduler form shows it under "PowerShell Command:")
• output verified against the legacy script across all 476 functions: identical except 2 param descriptions written as inline # comments instead of .PARAMETER blocks, both on Internal functions the endpoint filters out
• added to Dockerfile/Dockerfile.release as a build stage, and to build-dev-modules.ps1 for the local dev loop (generated file is gitignored/dockerignored, compose watch ignores it to avoid a double restart)
• pester tests for Invoke-ListFunctionParameters
• pester tests for the generator itself, synthesized synopses asserted byte-identical against live Get-Help on fixture modules.