Add command line interface support

A command line interface provides a way to perform backup, archive, and restore processes without having to build an application around the archiver library.

Example usage that will use the `Azure.Identity` `[DefaultAzureCredential](https://docs.microsoft.com/en-us/dotnet/api/azure.identity.defaultazurecredential?view=azure-dotnet)` provider so it can use environment variables or prompt for Azure login and requires both resources be accessible by the authenticated user:
```
# Create an archive from tables to a blob container
aztablearchiver
archive
--tablesSubscription
--tablesResourceGroup
--tablesName
--containerSubscription
--containerResourceGroup
--containerName

# Restore an archive from a blob container to tables
aztablearchiver
restore
--containerSubscription
--containerResourceGroup
--containerName
--tablesSubscription
--tablesResourceGroup
--tablesName
```

Example usage that will use connection strings for both resources:
```
# Create an archive from tables to a blob container
aztablearchiver
archive
--tablesConnectionString
--containerConnectionString
--containerName

# Restore an archive from a blob container to tables
aztablearchiver
restore
--tablesConnectionString
--containerConnectionString
--containerName
```

No implementation files or tests are named. Start by reviewing the existing archiver library API and the two documented archive/restore flows; done means a usable aztablearchiver command supports the listed Azure resource options and connection-string examples.

Written by the indexing model from the issue text.