Implement CosmosDBOptions to allow configuration of the CosmosDB service client via CosmosClientOptions

[liliankasem]

Issue describing the changes in this PR

resolves #2450

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR - TBD: need to check if document the default being Gateway
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests) - TODO

Additional information

Implement CosmosDBOptions for the cosmos extension that will expose CosmosClientOptions and allow users to configure the CosmosClient.

Breaking Change

Due to the default value for ConnectionMode in CosmosClientOptions being Direct, this change will introduce a breaking change for users who rely on the implicit default connection mode being Gateway. Currently, this extension has defaulted to using Gateway a the connection mode. Now that we are exposing CosmosClientOptions, we cannot differentiate between a user explicitly setting the connection mode to Direct and the SDK's default value of Direct. Therefore, we have to default to the SDK's default value.

If there are alternative approaches to this, please let me know!