[Rule] Use Bulk API for high-volume ingestion operations

[sajeetharan]

When inserting, updating, or deleting large numbers of documents (hundreds+), using the Bulk API is far more efficient than individual operations. The SDK batches requests internally and manages parallelism.

We need a rule covering:

• .NET: \AllowBulkExecution = true\ on \CosmosClientOptions\
• Java: \�nableBulk()\ on \CosmosContainerProperties\
• Python: \container.execute_item_batch()\
• When NOT to use bulk (small batches, latency-sensitive reads)

Category: \sdk-\ SDK Best Practices
Impact: High
Suggested file: \skills/cosmosdb-best-practices/rules/sdk-bulk-operations.md\

References:

• https://learn.microsoft.com/azure/cosmos-db/nosql/tutorial-dotnet-bulk-import
• https://learn.microsoft.com/azure/cosmos-db/nosql/best-practice-dotnet#use-bulk-support

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This is a good first issue! Follow the Contributing Guide and use the rule template to get started.