[master < E-meta] Add MAGE meta module docs

[imilinovic]

Description

Add MAGE meta module docs

Pull request type

Please delete options that are not relevant and check the ones that are.

• New documentation page

Related PRs and issues

PR this doc page is related to:
PR296
Closes (link to issue):

Checklist:

• I checked all content with Grammarly
• I performed a self-review of my code
• I made corresponding changes to the rest of the documentation
• The build passes locally
• My changes generate no new warnings or errors

[vpavicic]

Suggested change

	## stats
	## `stats()`

If it's a procedure?

[imilinovic]

Stats is not a procedure but it made sense to me to write about it since stats_online and stats_offline do the same thing (described in stats) so I wrote it as some sort of summary

[vpavicic]

Suggested change

	- stats_online - works in **O(1)** and requires setting up a trigger
	- stats_offline - traverses the whole graph
	- `stats_online` - works in **O(1)** and requires setting up a trigger
	- `stats_offline` - traverses the whole graph

[vpavicic]

Are you listing the same outputs three times then?
I don't think i would do that... i would just have stats online and offline and then this knowledge

• stats_online - works in O(1) and requires setting up a trigger
• stats_offline - traverses the whole graph

can be in the intro, or each in its own section.

It's confusing like this + different from all the other mage pages

[vpavicic]

Suggested change

	Retrieves the graph metadata by traversing the whole graph. *stats_online* should be preferred because of the better complexity unless you don't want to use triggers.
	Retrieves the graph metadata by traversing the whole graph. `stats_online` should be preferred because of the better complexity unless you don't want to use triggers.

[vpavicic]

i think i would have just online and offline headings, without the summary stats

[vpavicic]

This was already in the util category