DRIVERS-2732 CSFLE/QE KMIP support for encrypt/decrypt

[adriandole]

Please complete the following before merging:

• Update changelog.
• Make sure there are generated JSON files from the YAML test files.
• Test changes in at least one language driver. C implementation
• Test these changes against all server versions and topologies (including standalone, replica set, sharded
  clusters, and serverless).

[kevinAlbs]

Looks good overall. Suggest removing one of the delegated options to simplify the interface.

I suggest waiting until corresponding drivers-evergreen-tools changes (for new KMIP key?), libmongocrypt changes, and C driver changes are approved before merging. The reviews for those changes may reveal required test changes.

[kevinAlbs]

LGTM with one additional spec update.

[katcharov]

LGTM

[kevinAlbs]

The client-side-encryption.rst file was recently converted to markdown as part of DRIVERS-2789. client-side-encryption.rst now has this note:

This specification has been converted to Markdown and renamed to
client-side-encryption.md <client-side-encryption.md>_.
Use the link above to access the latest version of the specification as the
current reStructuredText file will no longer be updated.

Prior to merging, apply the changes to the markdown file and revert the reStructuredText changes.