Add comprehensive BuildSettings types and TS fixes (#49)

Expand the BuildSettings interface with a large, organized set of Xcode build setting keys (SDK, Architectures, Deployment, Versioning, Product, Info.plist keys, Code Signing, Swift, Clang, GCC, Linking, warnings, and more), adding precise types, enums and documentation comments for each section. Also remove a couple of transient @ts-expect-error comments in XCBuildConfiguration when resolving settings so the code relies on the improved typings. These changes increase TypeScript coverage for Xcode settings and clean up previously suppressed type errors; review callers for potential typing adjustments if they depended on looser types.

Author: EvanBacon

src/api/XCBuildConfiguration.ts

@@ -149,13 +149,11 @@ export class XCBuildConfiguration extends AbstractObject<XCBuildConfigurationMod
         );
       }
 
-      // @ts-expect-error: A setting could refer to another setting that isn't of type string.
       return this.props.buildSettings[sub];
     };
 
     const setting = this.props.buildSettings[buildSetting];
     if (typeof setting === "string") {
-      // @ts-expect-error
       return resolveXcodeBuildSetting(setting, resolver);
     }
     if (Array.isArray(setting)) {