feat: add group by handlebar helper

[jainpawan21]

What change does this PR introduce?

Add new groupBy handlebar helper to group array values by property

Why was this change needed?

Other information (Screenshots)

Context:-

{{#each (groupBy names "name")}}
 <h1>{{key}}<h1>
 {{#each items}}
   {{age}}-
 {{/each}}
{{/each}}

Input

{
	"names": [{
		"name": "Name 1",
		"age": "30"
	}, {
		"name": "Name 2",
    "age": "31"
	}, {
		"name": "Name 1",
    "age": "32"
	}]
}

Output:-

<h1>Name 1<h1>
   30-
   32-
 <h1>Name 2<h1>
   31-

[github-actions]

Pull reviewers stats

Stats of the last 30 days for novu:

	User	Total reviews	Time to review	Total comments
	p-fernandez	59	17h 32m	181
	LetItRock	21	1d 5h 5m	76
	djabarovgeorge	14	2d 9h 53m	53
	ainouzgali	12	9h 25m	47
	scopsy	12	59m	3
	unicodeveloper	11	8d 1h 29m	115
	jainpawan21	5	3h 16m	2
	davidsoderberg	4	16h 18m	2
	BiswaViraj	4	1d 22h 30m	2
	Cliftonz	2	12h 3m	6
	peoray	1	27m	1
	michaldziuba03	1	10h 53m	1

[scopsy]

Looking good! Could you please resolve the spellcheck error by adding groupby as a word? And also, maybe worth updating the docs for it?

[jainpawan21]

Looking good! Could you please resolve the spellcheck error by adding groupby as a word? And also, maybe worth updating the docs for it?

Fixed SpellCheck Errors
The Devex team is working on separate documentation to list all helpers.
I will share this helper with them to add