MONGOCRYPT-561 enable QEv2 protocol by default (#621)

* default to using FLEv2 (aka QEv2)

* replace TESTER_MONGOCRYPT_WITH_CRYPT_V2 with V1

Tests default to using V2, and must opt in to using V1

* update _test_encrypt_fle2_encryption_placeholder for new default

* enable QEv1 in QEv1 tests

* fix incorrect payload in encrypted-payload.json

Old payload did not include 'e' field.

* remove mongocrypt_setopt_fle2v2 from Java bindings

Calling is no longer necessary. QEv2 is now the default.

* remove mongocrypt_setopt_fle2v2 from Node bindings

Calling is no longer necessary. QEv2 is now the default.

* add fle2-find-range-explicit-v2/int32 test data

Intended for use in the Java and Python bindings tests.

* update test_range_query_int32 in Python bindings

* update testExplicitEncryptionDecryption in Java bindings

* remove mongocrypt_setopt_fle2v2 from public API

* remove mongocrypt_setopt_fle2v2 from C# bindings

Author: kevinAlbs

src/mongocrypt.cc

@@ -479,7 +479,6 @@ MongoCrypt::MongoCrypt(const CallbackInfo& info)
     }
 
     mongocrypt_setopt_use_need_kms_credentials_state(_mongo_crypt.get());
-    mongocrypt_setopt_fle2v2(_mongo_crypt.get(), true);
 
     // Initialize after all options are set.
     if (!mongocrypt_init(_mongo_crypt.get())) {