CDRIVER-4493 collect FaaS platform info in handshake metadata (#1340)

Include FaaS info (provider, timeout, memory, region) in handshake
---------

Co-authored-by: Kevin Albertson <[email protected]>

Author: adriandole

src/libbson/src/bson/bson.c

@@ -2296,7 +2296,6 @@ bson_copy_to_excluding_noinit (const bson_t *src,
    va_end (args);
 }
 
-
 void
 bson_destroy (bson_t *bson)
 {

src/libbson/src/bson/bson.h

@@ -361,6 +361,7 @@ bson_copy_to_excluding_noinit_va (const bson_t *src,
                                   const char *first_exclude,
                                   va_list args);
 
+
 /**
  * bson_destroy:
  * @bson: A bson_t.

src/libmongoc/src/mongoc/mongoc-handshake-private.h

@@ -85,6 +85,18 @@ typedef enum {
    LAST_MONGOC_MD_FLAG
 } mongoc_handshake_config_flag_bit_t;
 
+typedef enum {
+   MONGOC_HANDSHAKE_ENV_NONE,
+   MONGOC_HANDSHAKE_ENV_AWS,
+   MONGOC_HANDSHAKE_ENV_VERCEL,
+   MONGOC_HANDSHAKE_ENV_GCP,
+   MONGOC_HANDSHAKE_ENV_AZURE
+} mongoc_handshake_env_t;
+
+typedef struct _optional_int32 {
+   bool set;
+   int32_t value;
+} optional_int32;
 
 typedef struct _mongoc_handshake_t {
    char *os_type;
@@ -97,6 +109,11 @@ typedef struct _mongoc_handshake_t {
    char *platform;
    char *compiler_info;
    char *flags;
+   
+   mongoc_handshake_env_t env;
+   optional_int32 env_timeout_sec;
+   optional_int32 env_memory_mb;
+   char *env_region;
 
    bool frozen;
 } mongoc_handshake_t;
@@ -107,8 +124,8 @@ _mongoc_handshake_init (void);
 void
 _mongoc_handshake_cleanup (void);
 
-bool
-_mongoc_handshake_build_doc_with_application (bson_t *doc,
+bson_t *
+_mongoc_handshake_build_doc_with_application (
                                               const char *application);
 
 void