Spring-ai Refactor SearchRequest builder methods

• Deprecate builder methods with the prefix with
• Since there is a conflicting method named query(String) which returns the instance of SearchRequest, changed the existing builder method query(String) to queryString(String)
• Update docs and references

Comment From: markpollack

There should be an inner Builder class and the the static method

    public static SearchRequest query(String query) {
        Assert.notNull(query, "Query can not be null.");
        return new SearchRequest(query);
    }

should be deprecated.