feat(core): Implement v8::XXX args and return

[mmastrac]

op2 support for v8::Value and related types. Functions may take arguments of the form &v8::String (or &mut v8::String), v8::Local<v8::String>, or an Option<...> of any of these. Under the hood, the op system will check the type of the argument and automatically throw a type error if it does not match.

Implements:

• v8::Localv8::XXX for arguments (including automatic casting so v8::String will work)
• v8::Localv8::XXX for return types
• Option<v8::Local<...>> for arguments and returns
• &v8::XXX and Option<&v8:XXX> for arguments (ie: pass a &mut v8::String without a handle)
• HandleScope

Additional changes:

• Fixes clippy attributes on ops
• Refactoring of signature parser to be slightly less tied to our final arg/return types
• Ensures that lifetimes are properly added to call

[CLAassistant]

All committers have signed the CLA.

[bartlomieju]

Can this be handled by the op itself so we don't need to spam these ignores everywhere in our code?

[mmastrac]

This is only used here in the tests because the lifetime is useless and I wanted some tests that included it. It works fine without it, but then we're not exercising the lifetime code paths.

[bartlomieju]

LGTM