fix: borrow checker errors with isolate and object wrap usage

[littledivy]

error[E0308]: mismatched types
   --> ext/webstorage/lib.rs:55:1
    |
55  | #[op2]
    | ^^^^^^
    | |
    | expected `&mut HandleScope<'_, ()>`, found `&mut &mut Isolate`
    | arguments to this function are incorrect
    |
    = note: expected mutable reference `&mut HandleScope<'_, ()>`
               found mutable reference `&mut &mut Isolate`
note: associated function defined here
   --> /Users/divy/.cargo/registry/src/index.crates.io-6f17d22bba15001f/v8-130.0.1/src/string.rs:368:10
    |
368 |   pub fn new_from_one_byte<'s>(
    |          ^^^^^^^^^^^^^^^^^
    = note: this error originates in the attribute macro `op2` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0308]: mismatched types
   --> ext/webstorage/lib.rs:55:1
    |
55  | #[op2]
    | ^^^^^^
    | |
    | expected `&mut HandleScope<'_>`, found `&mut &mut Isolate`
    | arguments to this function are incorrect
    |
    = note: expected mutable reference `&mut HandleScope<'_>`
               found mutable reference `&mut &mut Isolate`
note: associated function defined here
   --> /Users/divy/.cargo/registry/src/index.crates.io-6f17d22bba15001f/v8-130.0.1/src/exception.rs:368:10
    |
368 |   pub fn type_error<'s>(
    |          ^^^^^^^^^^
    = note: this error originates in the attribute macro `op2` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0599]: no method named `throw_exception` found for mutable reference `&mut Isolate` in the current scope
  --> ext/webstorage/lib.rs:55:1
   |
55 | #[op2]
   | ^^^^^^ method not found in `&mut Isolate`
   |
note: there's an earlier shadowed binding `scope` of type `CallbackScope<'_>` that has method `throw_exception` available
  --> ext/webstorage/lib.rs:55:1
   |
55 | #[op2]
   | ^^^^^^
   | |
   | `scope` of type `CallbackScope<'_>` that has method `throw_exception` defined earlier here
   | earlier `scope` shadowed here with type `&mut Isolate`
   = note: this error originates in the attribute macro `op2` (in Nightly builds, run with -Z macro-backtrace for more info)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.52%. Comparing base (0c7f83e) to head (414a515).
Report is 170 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #970      +/-   ##
==========================================
+ Coverage   81.43%   81.52%   +0.08%     
==========================================
  Files          97       98       +1     
  Lines       23877    25379    +1502     
==========================================
+ Hits        19445    20690    +1245     
- Misses       4432     4689     +257     

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