Adding MAR Manifest file generator

[krbar]

Overview/Summary

Adding script to re-create the MAR Manifest file from the current CSV module indexes.

This PR fixes/adds/changes/removes

1. adds Script utilities/tools/MARManifestGenerator/Set-MARManifest.ps1
2. adds Header/Template file utilities/tools/MARManifestGenerator/src/manifestHeader.yml, which contains the constant part of the manifest file

Script usage example:

# Load the function Set-MARManifest
. .\utilities\tools\MARManifestGenerator\Set-MARManifest.ps1  

# Run the function
Set-MARManifest -OutputFile .\bicep-new.yml 

Breaking Changes

none

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[AlexanderSehr]

Suggested change

	[string] $OutputFile = $(Join-Path $PSScriptRoot 'bicep.yml')
	[string] $OutputFile = Join-Path $PSScriptRoot 'bicep.yml'

[AlexanderSehr]

Suggested change

	$item.ModuleOwnersGHTeam = $item.ModuleOwnersGHTeam -replace '@Azure/', ''
	$item.ModuleOwnersGHTeam = $item.ModuleOwnersGHTeam -replace '@Azure\/', ''

Careful with the regex

[AlexanderSehr]

Suggested change

	$item.ModuleContributorsGHTeam = $item.ModuleContributorsGHTeam -replace '@Azure/', ''
	$item.ModuleContributorsGHTeam = $item.ModuleContributorsGHTeam -replace '@Azure\/', ''

[AlexanderSehr]

@matebarabas , a comment of rememberence