src: handle empty MaybeLocal in cjs_lexer::Parse

[anonrig]

CreateString() and Parse() in src/node_cjs_lexer.cc unconditionally called ToLocalChecked() on the results of String::NewFromOneByte(), String::NewFromUtf8() and Set::Add(). If string or handle allocation fails or an exception is pending on the isolate, these return an empty MaybeLocal and ToLocalChecked() aborts the whole process:

FATAL ERROR: v8::ToLocalChecked Empty MaybeLocal
 1: node::OnFatalError(char const*, char const*)
 3: node::cjs_lexer::Parse(v8::FunctionCallbackInfo<v8::Value> const&)

Parse() is on the hot path of every ESM import of a CJS module (cjsPreparseModuleExports in lib/internal/modules/esm/translators.js), which sits on a normal JS frame and can handle a thrown exception. This change makes CreateString() return MaybeLocal<String> and propagates failure from Parse() as a regular pending JavaScript exception, so an allocation failure surfaces as a recoverable module load error instead of a fatal abort. This matches the failure behavior of the previous WASM-based cjs-module-lexer and the MaybeLocal handling conventions used elsewhere in src/ (e.g. AsArray in src/util-inl.h).

No regression test: the failure requires V8 string/handle allocation to fail inside the binding (export names are bounded by source length, and Set::Add on a fresh Set runs no user code), which cannot be triggered deterministically from JS. Verified locally that test/es-module passes and that the stress reproducer from the issue runs clean.

Fixes: #63323
Refs: #61456