fix(NODE-5127): implement reject kmsRequest on server close

[alenakhineika]

Description

Handle onclose event in kmsRequest.

What is changing?

• Adding onclose handler to the socket
• Refactoring kmsRequest to async/await

Is there new documentation needed for these changes?

None

What is the motivation for this change?

NODE-5127
NODE-3959

Release Highlight

Fixed unresolved request issue in KMS requester

Internal to the field-level encryption machinery is a helper that opens a TLS socket to the KMS provider endpoint and submits a KMS request. The code neglected to add a 'close' event listener to the socket, which had the potential to improperly leave the promise pending indefinitely if no error was encountered.

Double check the following

• Ran npm run check:lint script
• 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