feat(NODE-6695): enable KMS retry protocol

[durran]

Description

Exposes methods required to retry KMS requests and enables them in libmongocrypt.

What is changing?

• Set the flag to retry KMS requests.
• Adds uSleep property and fail method.
• Bumps libmongocrypt to 1.12.

Is there new documentation needed for these changes?

None

What is the motivation for this change?

NODE-6695

Release Highlight

KMS requests are now retryable

Retrying KMS requests is now enabled and the new method uSleep and fail property are now exposed to handle the feature in the driver.

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