feat(isolated-declarations): support optional class methods

[escaton]

Example class

export class A {
  m1?(): void;
  m2(): void {}
}

Before the fix:

export declare class A {
  m1(): void;
}

with the fix:

export declare class A {
  m1?(): void;
  m2(): void;
}

[escaton]

@Dunqing one more ;)

[graphite-app]

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[codspeed-hq]

CodSpeed Performance Report

Merging #4035 will not alter performance

_{Comparing escaton:fixes-4 (6edd31a) with main (b007553)}

Summary

✅ 28 untouched benchmarks