feat: complete the design of instance constroller

packages/instance-controller/.dockerignore

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+# node_modules
+.env
+ecosystem.config.js
+# dist
+data
+src
+tests

packages/instance-controller/.gitignore

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+node_modules
+dist
+
+upload
+data/*
+tmp
+
+.env
+.env.local
+
+ecosystem.config.js
+.DS_Store

packages/instance-controller/Dockerfile

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+FROM node:16-alpine
+
+
+EXPOSE 9000
+WORKDIR /app
+ENV LOG_LEVEL=debug
+COPY . /app
+# RUN npm i
+# RUN npm run build
+USER node
+CMD [ "npm", "run", "start" ]

packages/instance-controller/README.md

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+
+
+# laf service controller
+
+
+### Application instance status
+```ts
+export enum ApplicationInstanceStatus {
+  CREATED = 'created',
+  PREPARED_START = 'prepared_start',
+  STARTING = 'starting',
+  RUNNING = 'running',
+  PREPARED_STOP = 'prepared_stop',
+  STOPPING = 'stopping',
+  STOPPED = 'stopped',
+  PREPARED_RESTART = 'prepared_restart',
+  RESTARTING = 'restarting'
+}
+
+```
+
+### instance status machine
+
+`created`: nop
+
+`prepared_start`: 
+  -> loop apps in `prepared_start`
+      -> start app instance for each
+      -> update app status to `starting`
+
+`starting`:
+  -> loop apps in `starting`
+      -> get instance status for each app
+      -> update running app status to `running`
+
+`running`: nop
+
+`prepared_stop`:
+  -> loop apps in `prepared_stop`
+      -> stop app instance for each
+      -> update app status to `stopping`
+
+`stopping`:
+  -> loop apps in `stopping`
+      -> get instance status for each app
+      -> update stopped app status to `stopped`
+
+`stopped`: nop
+
+`prepared_restart`:
+  -> loop apps in `prepared_restart`
+      -> stop app instance for each
+      -> update app status to `restarting`
+
+`restarting`:
+  -> loop apps in `restarting`
+      -> get instance status for each app
+      -> start stopped app & update app status to `starting`
+
+
+### scheduler logic design
+
+- set a timer to execute schedular loop
+- call each handlers in loop: 
+  - `prepared_start` handler
+  - `starting` handler
+  - `prepared_stop` handler
+  - `stopping` handler
+  - `prepared_restart` handler
+  - `restarting` handler