[Fix] Add support for ParenthesisTypeNodes

[tvillaren]

Why

As reported by @anthony-dandrea in #148 (comment), it doesn't work when there are parenthesis around the types:

// DoesntWork.ts
import type { BoolValue } from "google/protobuf/BoolValue";
export interface Broken {
  bool: (BoolValue | null);
}

// DoesWork.ts
import type { BoolValue } from "google/protobuf/BoolValue";
export interface Works {
  bool: BoolValue | null;
}

// google/protobuf/BoolValue.ts
export interface BoolValue {
  'value': (boolean);
}

This PR fixes this issue

[codecov-commenter]

Codecov Report

Merging #152 (690ec55) into main (8d3b297) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   97.33%   97.34%   +0.01%     
==========================================
  Files          14       14              
  Lines         676      679       +3     
  Branches      275      269       -6     
==========================================
+ Hits          658      661       +3     
  Misses         18       18              

Files Changed	Coverage Δ
src/utils/traverseTypes.ts	100.00% <100.00%> (ø)

[tvillaren]

Closing, included in https://github.com/fabien0102/ts-to-zod/pull/159/files