Fix #1054: Add missing AnyObject type export

Re-export AnyObject type for backward compatibility with v6.x.

In v6.x (TypeScript definitions), AnyObject was exported as:
  interface AnyObject { [key: string]: any; }

In v7.0.0, this type was removed, breaking code that imported it.

Added: export type AnyObject = Record<string, any>;

Note: FieldMetaState was already re-exported in PR #1072.

The other breaking changes mentioned in #1054 (FormState.values/dirty/etc
can be undefined, UseFieldConfig no longer generic) are intentional design
decisions in the Flow → TypeScript migration and should be documented in
release notes rather than changed.

Author: erikras-dinesh-agent

src/types.ts

@@ -11,6 +11,9 @@ import type {
 
 type SupportedInputs = "input" | "select" | "textarea";
 
+// Backward compatibility: Re-export AnyObject type
+export type AnyObject = Record<string, any>;
+
 export interface ReactContext<FormValues = Record<string, any>> {
   reactFinalForm: FormApi<FormValues>;
 }