Add new bindings generator; port SSLConfig (#23169)

Add a new generator for JS → Zig bindings. The bulk of the conversion is
done in C++, after which the data is transformed into an FFI-safe
representation, passed to Zig, and then finally transformed into
idiomatic Zig types.

In its current form, the new bindings generator supports:

* Signed and unsigned integers
* Floats (plus a “finite” variant that disallows NaN and infinities)
* Strings
* ArrayBuffer (accepts ArrayBuffer, TypedArray, or DataView)
* Blob
* Optional types
* Nullable types (allows null, whereas Optional only allows undefined)
* Arrays
* User-defined string enumerations
* User-defined unions (fields can optionally be named to provide a
better experience in Zig)
* Null and undefined, for use in unions (can more efficiently represent
optional/nullable unions than wrapping a union in an optional)
* User-defined dictionaries (arbitrary key-value pairs; expects a JS
object and parses it into a struct)
* Default values for dictionary members
* Alternative names for dictionary members (e.g., to support both
`serverName` and `servername` without taking up twice the space)
* Descriptive error messages
* Automatic `fromJS` functions in Zig for dictionaries
* Automatic `deinit` functions for the generated Zig types

Although this bindings generator has many features not present in
`bindgen.ts`, it does not yet implement all of `bindgen.ts`'s
functionality, so for the time being, it has been named `bindgenv2`, and
its configuration is specified in `.bindv2.ts` files. Once all
`bindgen.ts`'s functionality has been incorporated, it will be renamed.

This PR ports `SSLConfig` to use the new bindings generator; see
`SSLConfig.bindv2.ts`.

(For internal tracking: fixes STAB-1319, STAB-1322, STAB-1323,
STAB-1324)

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Alistair Smith <hi@alistair.sh>

build.zig

@@ -49,6 +49,7 @@ const BunBuildOptions = struct {
     enable_logs: bool = false,
     enable_asan: bool,
     enable_valgrind: bool,
+    use_mimalloc: bool,
     tracy_callstack_depth: u16,
     reported_nodejs_version: Version,
     /// To make iterating on some '@embedFile's faster, we load them at runtime
@@ -97,6 +98,7 @@ const BunBuildOptions = struct {
         opts.addOption(bool, "enable_logs", this.enable_logs);
         opts.addOption(bool, "enable_asan", this.enable_asan);
         opts.addOption(bool, "enable_valgrind", this.enable_valgrind);
+        opts.addOption(bool, "use_mimalloc", this.use_mimalloc);
         opts.addOption([]const u8, "reported_nodejs_version", b.fmt("{}", .{this.reported_nodejs_version}));
         opts.addOption(bool, "zig_self_hosted_backend", this.no_llvm);
         opts.addOption(bool, "override_no_export_cpp_apis", this.override_no_export_cpp_apis);
@@ -270,6 +272,7 @@ pub fn build(b: *Build) !void {
         .enable_logs = b.option(bool, "enable_logs", "Enable logs in release") orelse false,
         .enable_asan = b.option(bool, "enable_asan", "Enable asan") orelse false,
         .enable_valgrind = b.option(bool, "enable_valgrind", "Enable valgrind") orelse false,
+        .use_mimalloc = b.option(bool, "use_mimalloc", "Use mimalloc as default allocator") orelse false,
         .llvm_codegen_threads = b.option(u32, "llvm_codegen_threads", "Number of threads to use for LLVM codegen") orelse 1,
     };
 
@@ -500,6 +503,7 @@ fn addMultiCheck(
                 .no_llvm = root_build_options.no_llvm,
                 .enable_asan = root_build_options.enable_asan,
                 .enable_valgrind = root_build_options.enable_valgrind,
+                .use_mimalloc = root_build_options.use_mimalloc,
                 .override_no_export_cpp_apis = root_build_options.override_no_export_cpp_apis,
             };
 
@@ -720,6 +724,7 @@ fn addInternalImports(b: *Build, mod: *Module, opts: *BunBuildOptions) void {
     // Generated code exposed as individual modules.
     inline for (.{
         .{ .file = "ZigGeneratedClasses.zig", .import = "ZigGeneratedClasses" },
+        .{ .file = "bindgen_generated.zig", .import = "bindgen_generated" },
         .{ .file = "ResolvedSourceTag.zig", .import = "ResolvedSourceTag" },
         .{ .file = "ErrorCode.zig", .import = "ErrorCode" },
         .{ .file = "runtime.out.js", .enable = opts.shouldEmbedCode() },