fix: Preserve Unicode escape sequences in transformation

[zermelo-wisen]

Fixes#172.

Ensures that Unicode escape sequences (e.g., "\u{1D306}") are correctly preserved during the code transformation process. This fix addresses an issue where certain escape sequences were incorrectly converted when parsing and regenerating code.

The fix gives raw: true option to the meriyahparse function in transform.ts.

consttree=parse(code,{source: url.toString(),next: true,loc: true,module: true,onComment: comments,raw: true,// Added this line});

This test, which would fail without the fix, is added to transform.test.ts.

it("transforms unicode correctly",()=>{constinput=`const a = "\\u{1D306}";\n`;// Ensure that "\u{1D306}" is not converted to "t̆".expect(transform(input,newURL("file:///foo"),[newIdentityHook()])).toBe(input);});