Add a new providers for `Set-TemporaryAzureResourceNetworkAccess`

We have a requirement to extend the capabilities of this [Cmdlet](https://github.com/corvus-dotnet/Corvus.Deployment/blob/main/module/functions/azure/Set-TemporaryAzureResourceNetworkAccess.ps1) to support the following Azure resources:

* Key Vault
* Synapse Workspace

This will involve writing an additional 'provider' for each resource type. Documentation for how to approach this can be found [here](https://github.com/corvus-dotnet/Corvus.Deployment/tree/main/module/functions/azure/_azureResourceNetworkAccessHandlers#readme), it would also be useful to feedback any improvements to the documentation as part of this work.

There are also two sets of [Pester v4](https://pester.dev/docs/v4/quick-start) tests related to this:
* [Set-TemporaryAzureResourceNetworkAccess.Handlers.Tests.ps1](https://github.com/corvus-dotnet/Corvus.Deployment/blob/main/module/functions/azure/Set-TemporaryAzureResourceNetworkAccess.Handlers.Tests.ps1) - unit tests to ensure that all handlers implement the required functions
* [Set-TemporaryAzureResourceNetworkAccess.Tests.ps1](https://github.com/corvus-dotnet/Corvus.Deployment/blob/main/module/functions/azure/Set-TemporaryAzureResourceNetworkAccess.Tests.ps1) - integration tests to validate each handler

Start with the _azureResourceNetworkAccessHandlers README and module/functions/azure/Set-TemporaryAzureResourceNetworkAccess.ps1, then review the existing providers. Use Set-TemporaryAzureResourceNetworkAccess.Handlers.Tests.ps1 and Set-TemporaryAzureResourceNetworkAccess.Tests.ps1 as the checks for completion: Key Vault and Synapse Workspace handlers should implement the required functions and pass integration tests. Note any useful documentation improvements.

Written by the indexing model from the issue text.