MONGOCRYPT-768 refactor to support multiple schemas

[kevinAlbs]

Summary

Add mc_schema_broker_t to manage schemas for an auto encryption operation.

Tested with this libmongocrypt: https://spruce.mongodb.com/version/67abfe5152bbba0007c15d63
Tested with the C driver pointing to this branch: https://spruce.mongodb.com/version/67ac860a932f4c0007855354

Background & Motivation

No meaningful changes to behavior are expected. This refactor is intended to help support $lookup in MONGOCRYPT-741. Supporting $lookup requires multiple schemas in one operation. mc_schema_broker_t supports multiple schemas to the same database.

The term schema refers to either a JSON Schema (for CSFLE) or an encryptedFields document (for QE).

SPM-2472 adds a new field to mongocryptd/crypt_shared: csfleEncryptionSchemas. This is to support passing multiple CSFLE schemas. encryptionInformation already supports passing multiple QE schemas. The syntax for csfleEncryptionSchemas is documented in Technical Design: Support $lookup in CSFLE and QE.

Test runner improvements

Additional test runner improvements were made to help test mc_schema_broker_t.

Wildcard test selection

Support trailing wildcard in test selection to ease running related tests:

# Run all tests with names starting with `test_mc_schema_broker`:
./cmake-build/test-mongocrypt "test_mc_schema_broker*"

TMP_BSONF

Several tests use the following pattern to declare BSON inline:

TMP_BSON(BSON_STR({"foo" : "bar"}));

Using BSON_STR has the advantage of improved formatting and syntax highlighting. However, a %s is formatted to % s:

TMP_BSON(BSON_STR({"foo" : % s}), "bar"); // Does not work!

This PR adds TMP_BSONF which supports MC_BSON and MC_STR formatting tokens to insert a bson_t* or C string:

bson_t *expect = TMP_BSONF(BSON_STR({
                                "find" : "coll",
                                "csfleEncryptionSchemas" : {
                                    "db.coll" : {"schema" : MC_BSON, "isRemoteSchema" : false},
                                    "db.coll2" : {"schema" : MC_BSON, "isRemoteSchema" : false}
                                }
                            }),
                            jsonSchema,
                            jsonSchema2);

TEST_FILE_AS_BSON

A new TEST_FILE_AS_BSON is added to load a file as a bson_t* rather than a mongocrypt_binary_t*. This was convenient for testing mc_schema_broker_t which accepts bson_t* in the interface.

[kevinAlbs]

Further testing motivated additional changes that seemed appropriate for this PR:

• Missing use of mc_schema_broker_append_listCollections_filter: c8b6a28
• Incorrect assumption that target collection has encryptedFields: bdcb389
• Fix naming of field in csfleEncryptionSchemas (schema => jsonSchema): e683b33

[eramongodb]

A few suggestions remaining; otherwise, LGTM.

[eramongodb]

This should probably be demoted to a runtime error rather than an assertion (otherwise the "expected 'explain' to be a document" error below could also be asserted).