Replace gRPC Backend (#10)

**Rationale:**

Having two separate servers and communication methods resulted in additional maintenance & the need to convert often between backend & frontend data types.
By moving the backend communication off of gRPC and to just use websockets it both gives more control & allows for simplification of the implementation.

#8

**Changes:**

- Replaces gRPC backend.
  - New implementation automatically handles reconnect logic
- Implements an api layer
- Migrates examples to the api layer
- Implements a proc macro to make command handling easier
- Implements unit tests for the api layer (90+% coverage)
- Implements integration tests for the proc macro (90+% coverage)

Reviewed-on: #10
Co-authored-by: Sergey Savelyev <sergeysav.nn@gmail.com>
Co-committed-by: Sergey Savelyev <sergeysav.nn@gmail.com>

server/src/http/api/panels.rs

@@ -4,6 +4,7 @@ use crate::panels::PanelService;
 use actix_web::{delete, get, post, put, web, Responder};
 use serde::Deserialize;
 use std::sync::Arc;
+use uuid::Uuid;
 
 #[derive(Deserialize)]
 struct CreateParam {
@@ -13,7 +14,7 @@ struct CreateParam {
 
 #[derive(Deserialize)]
 struct IdParam {
-    id: String,
+    id: Uuid,
 }
 
 #[post("/panel")]
@@ -22,7 +23,7 @@ pub(super) async fn new(
     data: web::Json<CreateParam>,
 ) -> Result<impl Responder, HttpServerResultError> {
     let uuid = panels.create(&data.name, &data.data).await?;
-    Ok(web::Json(uuid.value))
+    Ok(web::Json(uuid))
 }
 
 #[get("/panel")]
@@ -38,12 +39,10 @@ pub(super) async fn get_one(
     panels: web::Data<Arc<PanelService>>,
     path: web::Path<IdParam>,
 ) -> Result<impl Responder, HttpServerResultError> {
-    let result = panels.read(path.id.clone().into()).await?;
+    let result = panels.read(path.id).await?;
     match result {
         Some(result) => Ok(web::Json(result)),
-        None => Err(HttpServerResultError::PanelUuidNotFound {
-            uuid: path.id.clone(),
-        }),
+        None => Err(HttpServerResultError::PanelUuidNotFound { uuid: path.id }),
     }
 }
 
@@ -53,7 +52,7 @@ pub(super) async fn set(
     path: web::Path<IdParam>,
     data: web::Json<PanelUpdate>,
 ) -> Result<impl Responder, HttpServerResultError> {
-    panels.update(path.id.clone().into(), data.0).await?;
+    panels.update(path.id, data.0).await?;
     Ok(web::Json(()))
 }
 
@@ -62,6 +61,6 @@ pub(super) async fn delete(
     panels: web::Data<Arc<PanelService>>,
     path: web::Path<IdParam>,
 ) -> Result<impl Responder, HttpServerResultError> {
-    panels.delete(path.id.clone().into()).await?;
+    panels.delete(path.id).await?;
     Ok(web::Json(()))
 }