feat: replace socket.io with websocket

.env.example

README.md

apps/gateway/src/app/app.controller.ts

apps/gateway/src/app/events.gateway.ts

apps/gateway/src/main.ts

compose/env/holder.env

compose/env/holder.simple.env

compose/env/issuer.env

compose/env/issuer.simple.env

libs/config/src/config/gateway.config.ts

libs/config/src/interfaces/gateway.config.interface.ts

libs/config/src/schemas/gateway.schema.ts

package.json

yarn.lock