Add support for OIDC client assertion authentication

[jmapro]

• Introduced client_assertion and client_assertion_path config fields for OIDC federated identity
• Updated authentication flow to support OIDC credentials in both GetNewSessionUpdated and GetNewSession
• Added azcoreTokenAuthorizer bridge for using OIDC credentials with legacy SDK clients
• Enhanced documentation and config examples for new authentication method

closes #1014

Integration test logs

Logs

N/A

Example query results

Results

Test done with this obfuscated configuration

      connection "azure" {
        plugin      = "azure"
        type        = "aggregator"
        connections = ["azure_*"]
      }
      
      connection "azure_ c3e096e57a5f8d4f68d0bfd65fc01e66" {
        plugin                = "azure"
        tenant_id             = "8da3500a0f55b6071e7aeea62a6b6950"
        subscription_id       = " c3e096e57a5f8d4f68d0bfd65fc01e66"
        client_id             = "961c9a675b22ac0d408ccaeef8dc7132"
      }
      
      connection "azure_6f9524ded4e33c540b25df35a5da8a9a" {
        plugin                = "azure"
        tenant_id             = "8da3500a0f55b6071e7aeea62a6b6950"
        subscription_id       = "6f9524ded4e33c540b25df35a5da8a9a"
        client_id             = "961c9a675b22ac0d408ccaeef8dc7132"
        client_assertion_path = "/tmp/azure-oidc-token.txt"
      }

$ steampipe query "select md5(display_name) as display_name, md5(subscription_id) as subscription_id, md5(tenant_id) as tenant_id, cloud_environment from azure_subscription limit 5;"
+----------------------------------+----------------------------------+----------------------------------+-------------------+
| display_name                     | subscription_id                  | tenant_id                        | cloud_environment |
+----------------------------------+----------------------------------+----------------------------------+-------------------+
| b352f657e243096b4f3cd55663d9fafa | c3e096e57a5f8d4f68d0bfd65fc01e66 | 8da3500a0f55b6071e7aeea62a6b6950 | AzurePublicCloud  |
| 184bed812c3fac93865bffcb0b97ac57 | 6f9524ded4e33c540b25df35a5da8a9a | 8da3500a0f55b6071e7aeea62a6b6950 | AzurePublicCloud  |
+----------------------------------+----------------------------------+----------------------------------+-------------------+