Get rid of all transport types and settle on Protobuf (#25)

* Get rid of all transport types and settle on Protobuf

hope i don't regret this

* Update Cargo.toml

* Update agent.py

python/djls/proto/v1/check_pb2.pyi

@@ -0,0 +1,47 @@
+# WARNING: This file is generated by protobuf. DO NOT EDIT!
+# Any changes made to this file will be overwritten when the protobuf files are regenerated.
+# Source: v1/check.proto
+
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from typing import ClassVar as _ClassVar, Optional as _Optional
+
+DESCRIPTOR: _descriptor.FileDescriptor
+
+class HealthRequest(_message.Message):
+    __slots__ = ()
+    def __init__(self) -> None: ...
+
+class HealthResponse(_message.Message):
+    __slots__ = ("passed", "error")
+    PASSED_FIELD_NUMBER: _ClassVar[int]
+    ERROR_FIELD_NUMBER: _ClassVar[int]
+    passed: bool
+    error: str
+    def __init__(self, passed: bool = ..., error: _Optional[str] = ...) -> None: ...
+
+class DjangoAvailableRequest(_message.Message):
+    __slots__ = ()
+    def __init__(self) -> None: ...
+
+class DjangoAvailableResponse(_message.Message):
+    __slots__ = ("passed", "error")
+    PASSED_FIELD_NUMBER: _ClassVar[int]
+    ERROR_FIELD_NUMBER: _ClassVar[int]
+    passed: bool
+    error: str
+    def __init__(self, passed: bool = ..., error: _Optional[str] = ...) -> None: ...
+
+class AppInstalledRequest(_message.Message):
+    __slots__ = ("app_name",)
+    APP_NAME_FIELD_NUMBER: _ClassVar[int]
+    app_name: str
+    def __init__(self, app_name: _Optional[str] = ...) -> None: ...
+
+class AppInstalledResponse(_message.Message):
+    __slots__ = ("passed", "error")
+    PASSED_FIELD_NUMBER: _ClassVar[int]
+    ERROR_FIELD_NUMBER: _ClassVar[int]
+    passed: bool
+    error: str
+    def __init__(self, passed: bool = ..., error: _Optional[str] = ...) -> None: ...