perf: use jsonStringifyFast for faster JSON serialization (#25733)

## Summary

Apply the same optimization technique from PR #25717 (Response.json) to
other APIs that use JSON.stringify internally:

- **IPC message serialization** (`ipc.zig`) - used for inter-process
communication
- **console.log with %j format** (`ConsoleObject.zig`) - commonly used
for debugging
- **PostgreSQL JSON/JSONB types** (`PostgresRequest.zig`) - database
operations
- **MySQL JSON type** (`MySQLTypes.zig`) - database operations
- **Jest %j/%o format specifiers** (`jest.zig`) - test output formatting
- **Transpiler tsconfig/macros** (`JSTranspiler.zig`) - build
configuration

### Root Cause

When calling `JSONStringify(globalObject, value, 0)`, the space
parameter `0` becomes `jsNumber(0)`, which is NOT `undefined`. This
causes JSC's FastStringifier (SIMD-optimized) to bail out:

```cpp
// In WebKit's JSONObject.cpp FastStringifier::stringify()
if (!space.isUndefined()) {
    logOutcome("space"_s);
    return { };  // Bail out to slow path
}
```

Using `jsonStringifyFast` which passes `jsUndefined()` triggers the fast
path.

### Expected Performance Improvement

Based on PR #25717 results, these changes should provide ~3x speedup for
JSON serialization in the affected APIs.

## Test plan

- [x] Debug build compiles successfully
- [x] Basic functionality verified (IPC, console.log %j, Response.json)
- [x] Existing tests pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>

src/sql/postgres/PostgresRequest.zig

@@ -101,7 +101,8 @@ pub fn writeBind(
             .jsonb, .json => {
                 var str = bun.String.empty;
                 defer str.deref();
-                try value.jsonStringify(globalObject, 0, &str);
+                // Use jsonStringifyFast for SIMD-optimized serialization
+                try value.jsonStringifyFast(globalObject, &str);
                 const slice = str.toUTF8WithoutRef(bun.default_allocator);
                 defer slice.deinit();
                 const l = try writer.length();