wip serialize ModuleMap

It seems to be crashing on M1 with SIGSEGV :( cargo test -p deno_core snapshot

This approach won't work. We can only serialize things that are v8::Value using serde_v8 and v8::Module is v8::Data and not v8::Value.

Other approach to explore is to manually serialize ModuleMapInner into a V8 object - since all v8::Value are also v8::Data we could then embed it into the snapshot using SnapshotCreator::AddData method. This will require some manual labor for serialization, but seems doable. The disadvantage is that when creating a snapshot from an existing snapshot all embedded data is lost, so we'll need to figure out how to make it work with #14744

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