feat(NODE-5470)!: convert remaining FLE to TS and drop support for onKMSProvidersRefresh

[baileympearson]

Description

What is changing?

The remaining FLE files and tests are converted to TS. Additional changes:

• buffer_pool.js was removed and now FLE code imports the buffer pool from utils.ts.
• once and child_process are lazily imported in the state machine and mongodbcyptd manager, respectively
• lint has been re-enabled and once again covers all tests and src
• databaseNamespace and collectionNamespace have been removed in favor of MongoDBNamespace.

One other notable change is that when we fail to get kms provider information, the error thrown used to attach an originalError property. I adjusted this to use the error's cause, since Node16+ and MongoCryptErrors support the cause property.

I also removed support for onKMSProvidersRefresh here.

Is there new documentation needed for these changes?

No, documentation is coming in a follow up.

What is the motivation for this change?

Release Highlight

ClientEncryption.onKMSProvidersRefresh function removed

ClientEncryption.onKMSProvidersRefresh was added as a public API in version 2.3.0 of mongodb-client-encryption to allow for automatic refresh of KMS provider credentials. Subsequently, we've added the capability to automatically refresh KMS credentials using the KMS provider's preferred refresh mechanism, and onKMSProviderRefresh is no longer used.

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