Auto-generate the bindings from Frida's .gir

Replace the hand-written extension and core with a generator
(frida/frida_bindgen) that reads Frida's .gir files and emits the
_frida C extension plus the sync frida.* and async frida.aio.*
facades.

Covers construction, enumeration, attach/spawn with keyword-argument
options, sessions, scripts, script RPC (blocking and awaitable),
signals with flexible handler arity, exception mapping, lists,
vardict/variant, bytes and string arrays, and top-level device
helpers. Also emits a real .pyi for the extension.

The little logic that cannot come from the .gir -- the GObject glue,
the marshallers and the RPC layer -- lives in clearly scoped assets.

Author: oleavr

.gitignore

@@ -1,5 +1,7 @@
 *.pyc
+*.abi3.so
 /*.egg-info/
+/.cache/
 /build/
 /deps/
 /dist/