chore: adding the jest coverage script

[afshinm]

No description provided.

[github-actions]

jest coverage report 🧪

Total coverage

Status	Category	Percentage	Covered / Total
🟢	Statements	80.87%	1353/1673
🟡	Branches	68.63%	455/663
🟢	Functions	82.61%	285/345
🟢	Lines	80.7%	1204/1492

Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

[github-actions]

Size Change: 0 B

Total Size: 106 kB

ℹ️ View Unchanged

Filename	Size	Change
dist/gridjs.js	16.8 kB	0 B
dist/gridjs.modern.js	14.8 kB	0 B
dist/gridjs.module.js	16.8 kB	0 B
dist/gridjs.production.es.min.js	16.8 kB	0 B
dist/gridjs.production.min.js	16.8 kB	0 B
dist/gridjs.umd.js	16.8 kB	0 B
i18n/dist/i18n.js	790 B	0 B
i18n/dist/i18n.modern.js	800 B	0 B
i18n/dist/i18n.module.js	812 B	0 B
i18n/dist/i18n.umd.js	889 B	0 B
plugins/selection/dist/selection.js	1.04 kB	0 B
plugins/selection/dist/selection.modern.js	824 B	0 B
plugins/selection/dist/selection.module.js	1.05 kB	0 B
plugins/selection/dist/selection.umd.js	1.12 kB	0 B

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