SERVER-63383 Add Token Generation

src/mongo/crypto/SConscript

src/mongo/crypto/encryption_fields.idl

src/mongo/crypto/fle_crypto.cpp

src/mongo/crypto/fle_crypto.h

src/mongo/crypto/fle_crypto_test.cpp

src/mongo/crypto/fle_field_schema.idl

src/mongo/db/matcher/schema/encrypt_schema.idl