`azdev setup` to also provide folder option for --repo parameter

azdev setup expects --repo parameter to be a git-repository

We would like the azdev setup to be able to accept a folder(not necessarily a git repo).

We have multiple versions of az cli extension for our service (networkcloud) and we would like to setup/install a specific version at a time.

 =======================
 | Azure CLI Dev Setup |
 =======================

 Azure CLI:
     PyPI

 Azure CLI extension repos:
     /__w/1/s

 Azure CLI extensions:
     /__w/1/s/cli-ext/v20230501preview/ext/src/networkcloud
     /__w/1/s/cli-ext/v20221212preview/ext/src/networkcloud

  Installing packages 
 =====================

 Upgrading pip...
 Installing `azure-cli`...
 Installing `azure-cli-testsdk`...
 Adding extension '/__w/1/s/cli-ext/v20230501preview/ext/src/networkcloud'...
 Adding extension '/__w/1/s/cli-ext/v20221212preview/ext/src/networkcloud'...

 Elapsed time: 2 min 18 sec

  Finished dev setup! 
 =====================

 [
   {
     "install": "",
     "name": "networkcloud",
     "path": "/__w/1/s/cli-ext/v20230501preview/ext/src/networkcloud"
   },
   {
     "install": "",
     "name": "networkcloud",
     "path": "/__w/1/s/cli-ext/v20221212preview/ext/src/networkcloud"
   }
 ]
 ## pinning to specific version due to failure observed in urllib3.connectionpool
 Found existing installation: urllib3 1.26.16
 Uninstalling urllib3-1.26.16:
   Successfully uninstalled urllib3-1.26.16
 Looking in indexes: https://build:***@pkgs.dev.azure.com/msazuredev/AzureForOperatorsIndustry/_packaging/AzureForOperatorsIndustry_PublicPackages/pypi/simple
 Collecting urllib3==1.25.8
   Downloading https://pkgs.dev.azure.com/msazuredev/c0b6323e-5225-48c2-85df-819f77430aea/_packaging/c900f78d-fdf9-4052-9954-36e35dc9bcb9/pypi/download/urllib3/1.25.8/urllib3-1.25.8-py2.py3-none-any.whl (125 kB)

Azure / azure-cli-dev-tools

`azdev setup` to also provide folder option for --repo parameter #386