Create project based on template and allow namespace per full path

[jpatigny]

Add possibility to :

• Create project based on template (official or custom)
• Set the namespace parameter as name or path

Examples :

New-GitLabProject -Path myproject -namespace mynamespace/repo
New-GitLabProject -Path myproject -namespace mynamespace/repo -template_name "myofficialtemplate" -use_custom_template $false
New-GitLabProject -Path myproject -namespace mynamespace/repo -template_name "mycustomtemplate" -use_custom_template $true