Rename crate from google-genai to geologia

geologia is an anagram of "google ai", avoiding use of the "google" name
in the crate identifier while preserving the project's identity.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

examples/raw_sse.rs

@@ -1,6 +1,6 @@
 use std::env;
 
-use google_genai::{
+use geologia::{
     network::event_source::EventSource,
     prelude::{Content, GenerateContentRequest, Role},
 };