polyfill: don't compile js on each env start

[krichprollsch]

Currently, when we load polyfills, we always compile and run javascript scripts.
It would be better to compile once and run multiple times.

An idea would be:

1. create a ScriptCompiler::Source [0]

2. replace the usage of ScriptCompiler::Compile [1] with ScriptCompiler::CompileUnboundScript [2]. Use the created ScriptCompiler::Source.
   ⚠️ The doc is wrong, the func needs a context (see https://chromium.googlesource.com/v8/v8.git/+/refs/heads/main/src/api/api.cc#2582 and https://groups.google.com/u/1/g/v8-users/c/btTLjLN9uZg/m/v6cZ64RKBQAJ

3. call ScriptCompiler::CreateCodeCache [3] to save a CachedDate.

4. call UnboundScript::BindToCurrentContext [4] to bind with the current context an retrieve a Script.

5. run the script [5]

6. The next start, pass the saved CachedData when creating the ScriptCompiler::Source [0]

7. repeat the following steps.

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lightpanda-io/zig-js-runtime#263 and lightpanda-io/zig-v8-fork#32 expose the UnboundScript functions but CachedData funcs are missing. A question is: how to encapsulate and expose v8 CachedData logic in zig-js-runtime?