Make BoundedArray more compact, shrink Data in sql from 32 bytes to 24 bytes (#22210)

### What does this PR do?

- Instead of storing `len` in `BoundedArray` as a `usize`, store it as
either a `u8` or ` u16` depending on the `buffer_capacity`
- Copy-paste `BoundedArray` from the standard library into Bun's
codebase as it was removed in
https://github.com/ziglang/zig/pull/24699/files#diff-cbd8cbbc17583cb9ea5cc0f711ce0ad447b446e62ea5ddbe29274696dce89e4f
and we will probably continue using it

### How did you verify your code works?

Ran `bun run zig:check`

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: taylor.fish <contact@taylor.fish>

src/HTMLScanner.zig

@@ -222,7 +222,7 @@ pub fn HTMLProcessor(
             var builder = lol.HTMLRewriter.Builder.init();
             defer builder.deinit();
 
-            var selectors: std.BoundedArray(*lol.HTMLSelector, tag_handlers.len + if (visit_document_tags) 3 else 0) = .{};
+            var selectors: bun.BoundedArray(*lol.HTMLSelector, tag_handlers.len + if (visit_document_tags) 3 else 0) = .{};
             defer for (selectors.slice()) |selector| {
                 selector.deinit();
             };