feat: kill process rpc service (#244)

* feat/kill-process:
 ### Add KillProcess RPC Method

 - **Added `KillProcess` RPC Method**: Introduced a new RPC method `KillProcess` in the `Frontend` service to allow killing a running process on the frontend.
   - Updated files: `server.grpc.pb.cc`, `server.grpc.pb.h`, `server.pb.cc`, `server.pb.h`, `server.proto`
   - Added new request and response messages: `KillProcessRequest` and `KillProcessResponse`.

 - **Java Bindings**: Updated Java bindings to include the new `KillProcess` method.
   - Updated file: `Server.java`

* feat/kill-process:
 **Update `server.proto` for KillProcessRequest and KillProcessResponse**

 - Added `server_addr` field to `KillProcessRequest` for specifying the frontend server address.
 - Changed field numbers for `catalog` and `process_id` in `KillProcessRequest`.
 - Enhanced `KillProcessResponse` to include a `found` boolean indicating if the target process was located.

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

* rename found to success

---------

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

proto/greptime/v1/frontend/server.proto

@@ -23,6 +23,8 @@ option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1/front
 service Frontend {
   // List all running processes on frontend.
   rpc ListProcess(ListProcessRequest) returns (ListProcessResponse);
+  // Kill a running process on frontend.
+  rpc KillProcess(KillProcessRequest) returns (KillProcessResponse);
 }
 
 message ListProcessRequest {
@@ -33,6 +35,20 @@ message ListProcessResponse {
   repeated ProcessInfo processes = 1;
 }
 
+message KillProcessRequest {
+  // Frontend server address of process.
+  string server_addr = 1;
+  // Catalog of process to kill.
+  string catalog = 2;
+  // ID of process to kill.
+  uint64 process_id = 3;
+}
+
+message KillProcessResponse {
+  // Whether targeting process is successfully killed
+  bool success = 1;
+}
+
 message ProcessInfo {
   // ID.
   uint64 id = 1;