Update stacks API with Functions V4 supported runtimes

[Francisco-Gamino]

Updating stacks API with Functions V4 supported runtimes as defined here: Azure/Azure-Functions#1999

The table below with the V4 column shows the runtimes that are being enabled on this PR.

Language	v1	v2	v3	v4
Java	N/A	8	11, 8	11, 8
Node.js	6	10, 8	14, 12, 10	14
PowerShell	N/A	6	7.0, 6	7.21, 7.0
Python	N/A	3.7, 3.6	3.91, 3.8, 3.7, 3.6	3.91, 3.8, 3.7

¹ GA support of these versions in Azure Functions is expected by the end of 2021

Please note that Node 16 and Python 3.10 are missing from this list.

[Francisco-Gamino]

Hello all -- Could you please review the following changes?

@amamounelsayed / @apawast -- For Java 8 and Java 11
@alrod / @anthonychu -- For Node 14
@vrdmr / @stefanushinardi -- For Python 3.7, 3.8, 3.9
@stefanushinardi -- For PowerShell 7.0 and 7.2. Please note that currently there is PowerShell 7.0 support on Linux for Functions V3. After we sync with @AnatoliB , we can decide on whether PowerShell on Linux support will only be available in Functions V4.

[amamounelsayed]

Thank you @Francisco-Gamino, looks good sir

[Francisco-Gamino]

/cc @gzuber

[pragnagopa]

@Francisco-Gamino - please make sure content is aligned with https://github.com/Azure/azure-functions-ux/tree/dev/server/src/stacks/2020-10-01/stacks/function-app-stacks as that is the latest. This repo is not maintiained any more.

Please tag me in the PRs for AZ Powershell CMdlets updates.

[Francisco-Gamino]

@Francisco-Gamino - please make sure content is aligned with https://github.com/Azure/azure-functions-ux/tree/dev/server/src/stacks/2020-10-01/stacks/function-app-stacks as that is the latest. This repo is not maintiained any more.

Please tag me in the PRs for AZ Powershell CMdlets updates.

Will do. Thanks @pragnagopa .

[gzuber]

/cc @panchagnula