JS SDK Merge Support Feature

[ujjwalsoni1707]

Packages impacted by this PR

@azure/cosmos

Issues associated with this PR

#23417

Describe the problem that is addressed by this PR

Partition merge (preview) is one of feature in CosmosDB which allows us to reduce the number of physical partitions by merging them. With merge, containers that have low RU/s or storage per partition or storage can have their physical partition layout optimized for better performance. As of now this feature is not supported by the Node SDK and if the feature is enabled, all requests from Node SDK will be blocked. So, after this PR, Node SDK will support this feature.

What are the possible designs available to address the problem? If there are more than one possible design, why was the one in this PR chosen?

Are there test cases added in this PR? (If not, why?)

Yes

Provide a list of related PRs (if any)

Command used to generate this PR:**(Applicable only to SDK release request PRs)

Checklists

• Added impacted package name to the issue description
• Does this PR needs any fixes in the SDK Generator?** (If so, create an Issue in the Autorest/typescript repository and link it here)
• Added a changelog (if necessary)

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

@azure/cosmos