Dodanie paczki multiple-scripts-tmux i poprawa wizualna skryptu watch w sealious-playground

Summary:
Ref T2331

Test Plan: Wykonac komende npm run watch, powinno dzialac jak zawsze

Reviewers: #testers, #reviewers, brtkuu

Reviewed By: #reviewers, brtkuu

Subscribers: jenkins-user

Maniphest Tasks: T2331

Differential Revision: https://hub.sealcode.org/D1159

package.json

@@ -12,7 +12,7 @@
 		"build": "npm run build:back && npm run build:front",
 		"watch:back": "tsc --watch -p src/back",
 		"watch:front": "webpack --watch",
-		"watch": "tmux new-session -d \"printf '\\033]2;%s\\033\\' 'watch:back' && npm run watch:back\" && tmux split-window -d \"printf '\\033]2;%s\\033\\' 'server' && SEALIOUS_PORT=$SEALIOUS_PORT SEALIOUS_BASE_URL=$SEALIOUS_BASE_URL nodemon --enable-source-maps .\" && tmux split-window -d \"printf '\\033]2;%s\\033\\' 'watch:front' && npm run watch:front\"  && tmux select-layout even-horizontal && tmux set -g pane-border-status top && tmux set -g mouse on && tmux attach",
+		"watch": "multiple-scripts-tmux watch:back server watch:front",
 		"test-reports": "npm run build && rm -fr .xunit coverage && docker-compose up -d db mailcatcher  && npm run test -- --cover --test-report",
 		"cover-html": "npm run test-reports -- --cover-html && xdg-open coverage/lcov-report/index.html"
 	},
@@ -22,6 +22,7 @@
 		"@babel/core": "^7.12.10",
 		"@hotwired/turbo": "^7.0.0-beta.3",
 		"@koa/router": "^10.0.0",
+		"multiple-scripts-tmux": "^1.0.3",
 		"nodemon": "^2.0.7",
 		"sealious": "^0.13.38",
 		"stimulus": "^2.0.0"