Hey Node Team!

I am working on writing a Node.js tutorial for developer.mongodb.com for the CSFLE features, and I am running into issues with installing mongodb-client-encryption package. 

Could you add Node 14 (the same ABI I believe as v15) to the CI for mongodb-client-encryption so that prebuilds are made there?

Hoping to make CSFLE easier for new devs to get setup

Acceptance Criteria

• Add Node 14 to the matrix
• Ensure prebuilds for Node 14 can be generated.
• Do a force rebuild to generate the prebuilds and make them available for the current version.