Added new utility functions needed by LayoutGridForm (rjsf-team#4503)

* Added new utility functions needed by LayoutGridForm
Adding new functions to `@rjsf/utils` to support the upcoming `LayoutGridForm`
- Updated `@rjsf/utils` to add new types and functions in support of the `LayoutGridForm`
- Updated the `utility-functions.md` documentation for the new functions
- Updated the `v6.x upgrade guide.md` documentation for the new functions and types
- Updated the `CHANGELOG_V6.md` for the new functions and types

* - Fixed build and removed console.log

* Update packages/utils/src/schema/findSelectedOptionInXxxOf.ts

- Reviewer feedback

Author: heath-freenome

CHANGELOG_v6.md

@@ -68,7 +68,22 @@ should change the heading of the (upcoming) version to include a major version b
 - BREAKING CHANGE: Added two the following new, required props to `TemplatesType`:
   - `ArrayFieldItemButtonsTemplate: ComponentType<ArrayFieldItemButtonsTemplateType<T, S, F>>;`
   - `GridTemplate: ComponentType<GridTemplateProps>`
-- Added a new `buttonId<T>(id: IdSchema<T> | string, btn: 'add' | 'copy' | 'moveDown' | 'moveUp' | 'remove')` used to generate consistent ids for RJSF buttons
+- BREAKING CHANGE: Updated the `SchemaUtilsType` to add new validator-based functions to the interface
+- Added the following new non-validator utility functions:
+  - `buttonId<T>(id: IdSchema<T> | string, btn: 'add' | 'copy' | 'moveDown' | 'moveUp' | 'remove')`: used to generate consistent ids for RJSF buttons
+  - `getTestIds(): TestIdShape`: Returns an object of test IDs that can only be used in test mode, helpful for writing unit tests for React components
+  - `hashObject(object: unknown): string`: Stringifies an `object` and returns the hash of the resulting string
+  - `hashString(string: string): string`: Hashes a string into hex format
+  - `lookupFromFormContext<T = any, S extends StrictRJSFSchema = RJSFSchema, F extends FormContextType = any>(regOrFc: Registry<T, S, F> | Registry<T, S, F>['formContext'], toLookup: string, fallback?: unknown)`: Given a React JSON Schema Form registry or formContext object, return the value associated with `toLookup`
+- Added the following new validator-based utility functions:
+  - `findFieldInSchema<T = undefined, S extends StrictRJSFSchema = RJSFSchema, F extends FormContextType = any>(validator: ValidatorType<T, S, F>, rootSchema: S, path: string | string[], schema: S, formData?: T, experimental_customMergeAllOf?: Experimental_CustomMergeAllOf<S>): FoundFieldType<S>`: Finds the field specified by the `path` within the root or recursed `schema`
+  - `findSelectedOptionInXxxOf<T = any, S extends StrictRJSFSchema = RJSFSchema, F extends FormContextType = any>(validator: ValidatorType<T, S, F>, rootSchema: S, schema: S, fallbackField: string,xxx: 'anyOf' | 'oneOf', formData?: T, experimental_customMergeAllOf?: Experimental_CustomMergeAllOf<S>): S | undefined`: Finds the option that matches the selector field in the `schema` or undefined if nothing is selected
+  - `getFromSchema<T = any, S extends StrictRJSFSchema = RJSFSchema, F extends FormContextType = any>(validator: ValidatorType<T, S, F>, rootSchema: S, schema: S, path: string | string[], defaultValue: T | S, experimental_customMergeAllOf?: Experimental_CustomMergeAllOf<S>): T | S`: Helper that acts like lodash's `get` but additionally retrieves `$ref`s as needed to get the path for schemas
+
+
+## @rjsf/validator-ajv6
+
+- BREAKING CHANGE: This deprecated validator has been removed
 
 ## Dev / docs / playground