refactor(ops): first pass at op best practices

[AaronO]

This PR is a follow-up to #9843 and tweaks most ops across the codebase to follow our best practices for ops.

It's also important to move away from serde_json::Value to fully realize the perf gains of serde_v8 (since it otherwise does a double serializaiton and it's serialized as a loosely typed map, which is very inefficient, doesn't benefit from v8_struct_key optims, etc...)

Goals

1. More consistent op functions
2. More performant ops (removing overhead of json!() and serde_json::Value which are loosely typed)
3. Better typed op code (easier to maintain, catch bugs, etc...)

Changes related to best-practices

1. Remove wrappers for single args (e.g: { rid })
2. Remove single-keyed structs to deserialize said wrappers
3. Specific return values types instead of general Result<Value, AnyError>
4. Empty returns: Ok(json!({})) => Ok(())
5. Use rust's unit type for ignored/unused args
6. Remove most serde_json::* imports and sometimes serde::Deserialize (after dropping wrapper structs)
7. Remove pseudo-variadic ZeroCopyBufs in JS

Steps

• runtime/
  • Bulk of modules, with relatively simple changes
  • Modules like net that require introducing new general types
• op_crates

Notes

• Yes, this touches a lot of the code
• This should mostly change rust code, but I've touched JS code to match up the arg-unwrapping
• Some places that are loosely typed or that return HashMaps still use serde_json::Value
• This also applies to places where json!() offered some "useful" implicit conversions for references (e.g: &str, Cow, ...) to owned types (that can be returned and serialized), to my understanding there was no (performance) upside to returning refs, since json!() would convert them to owned types anyway

[AaronO]

This isn't exhaustive and doesn't fix all non-best practices, but fixes most of them.

Most of the remaining uses of serde_json::Value or json!() in ops are either loosely-typed returns or more involved returns (e.g: runtime/net) that should be handled in a follow-up.

[AaronO]

op_crates is now serde_json free, except websocket.

[bartlomieju]

The PR looks good to me, and if tests are passing I think we're good. Before landing I'll let other take a look

[bartlomieju]

LGTM