src: add string_view overload to snapshot FromBlob

The `const std::vector<char>&` variant only delegates to a method
that converts it to a `std::string_view` anyway, but adding this
capability to the public API as well means that it’s easier to
store snapshot data in embedding applications (because using
`std::vector<>` enforces heap allocation and `std::string_view`
does not).

src/api/embed_helpers.cc

@@ -315,6 +315,11 @@ EmbedderSnapshotData::Pointer EmbedderSnapshotData::BuiltinSnapshotData() {
 
 EmbedderSnapshotData::Pointer EmbedderSnapshotData::FromBlob(
     const std::vector<char>& in) {
+  return FromBlob(std::string_view(in.data(), in.size()));
+}
+
+EmbedderSnapshotData::Pointer EmbedderSnapshotData::FromBlob(
+    std::string_view in) {
   SnapshotData* snapshot_data = new SnapshotData();
   CHECK_EQ(snapshot_data->data_ownership, SnapshotData::DataOwnership::kOwned);
   EmbedderSnapshotData::Pointer result{

src/node.h

@@ -537,6 +537,7 @@ class EmbedderSnapshotData {
   // If the snapshot is invalid, this returns an empty pointer.
   static Pointer FromFile(FILE* in);
   static Pointer FromBlob(const std::vector<char>& in);
+  static Pointer FromBlob(std::string_view in);
 
   // Write this EmbedderSnapshotData object to an output file.
   // Calling this method will not close the FILE* handle.