feat(NODE-7230): add deprecations of items to be removed in v7

[durran]

Description

Summary of Changes

Notes for Reviewers

What is the motivation for this change?

Release Highlight

Deprecated items to be removed in 7.0.0

The following items have been deprecated and will be removed in 7.0.0:

MongoCredentials.authMechanismProperties.AWS_SESSION_TOKEN // URI & client options for AWS variables will no longer be respected
CommandOptions.noResponse // Unused
ConnectionOptions.cancellationToken // Unused
CursorStreamOptions // Only option, transform, removed in favor of Stream#map

Double check the following

• Lint is passing (npm run check:lint)
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

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[durran]

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