feat: load sourcemaps at runtime when using a bun build --target=bun bundle (#10998)

Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>

src/string.zig

@@ -266,10 +266,22 @@ pub const StringImplAllocator = struct {
 };
 
 pub const Tag = enum(u8) {
+    /// String is not valid. Observed on some failed operations.
+    /// To prevent crashes, this value acts similarly to .Empty (such as length = 0)
     Dead = 0,
+    /// String is backed by a WTF::StringImpl from JavaScriptCore.
+    /// Can be in either `latin1` or `utf16le` encodings.
     WTFStringImpl = 1,
+    /// Memory has an unknown owner, likely in Bun's Zig codebase. If `isGloballyAllocated`
+    /// is set, then it is owned by mimalloc. When converted to JSValue it has to be cloned
+    /// into a WTF::String.
+    /// Can be in either `utf8` or `utf16le` encodings.
     ZigString = 2,
+    /// Static memory that is guarenteed to never be freed. When converted to WTF::String,
+    /// the memory is not cloned, but instead referenced with WTF::ExternalStringImpl.
+    /// Can be in either `utf8` or `utf16le` encodings.
     StaticZigString = 3,
+    /// String is ""
     Empty = 4,
 };