[receiver/oracledbreceiver] add implementation of oracledbreceiver

[atoulme]

Description:
Initial implementation of the oracledbreceiver.

Link to tracking Issue:
#16043

Testing:
Unit testing. Also performed extensive manual testing.

Documentation:
README.md

[pmcollins]

There's kind of a lot of orthogonal functionality going on in this scraper. What do you think about splitting it up, perhaps into multiple, relatively small scrapers that get registered at startup time based on metric settings? That way, we'd end up with a few small types/functions and we won't have to checking setting on every scrape.

[atoulme]

I think having a single scraper is probably preferrable to send all metrics in one scrape and use at most one DB connection. The code could be nicer to look at, and refactored into smaller functions and appended as an array of calls that are set at start time if the setting is enabled.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[runforesight]

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✅  prometheus-compliance-tests workflow has finished in 10 minutes 54 seconds (⚠️ 1 minute 43 seconds more than main branch avg.) and finished at 8th Dec, 2022.

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[dmitryax]

Just couple of nits