Implement Cosmos alias management

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NOTE: This PR is based on #34066, review the 2nd commit only.

• The PR looks big, but is mostly NoSQL baseline changes for aliases (easy!)
• Introduce CosmosAliasManager, same as relational's SqlAliasManager
• Use the container name in the query instead of root (i.e. SELECT n from NorthwindContext n instead of SELECT c FROM root c).
• Remove SelectExpression construction out to CosmosQueryableMethodTranslatingEV, removing IEntityType knowledge from SelectExpression (same as in relational)

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Design discussion: revert the change to switch from root to the container name, since the container name may be long and we're not sure about special characters/escaping.