[+] add Single Query Details dashboard for Prometheus, relates to #1169

[Bishoywadea]

Add Single Query Details Dashboard for Prometheus

fixes #1169

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Description

This PR introduces the Single Query Details dashboard for Prometheus.

Included Panels:

• Avg Runtime
• Total Runtime
• Calls Rate
• Shared Buffers Hit Ratio
• Temp Blocks Read/Written
• Backend Block Read/Write Time
• % of Total Time in Direct I/O
• SQL Text
• Logo Panel

Screenshot

[Bishoywadea]

Hi @0xgouda , i have set up a single-query Prometheus dashboard for review, I only included 2 panels for now to make sure the logic is correct before i build the rest.
if this looks good, I will finish the other panels and your suggestions,
I am planning to finish v12 first to move faster, then i will do all of v11 at once. is that okay with you?

[0xgouda]

Looks good, please continue.

No need to create the dashboard for v11.

[coveralls]

Pull Request Test Coverage Report for Build 21684561041

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.153%

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Totals
Change from base Build 21680441287:	0.0%
Covered Lines:	4184
Relevant Lines:	5423

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💛 - Coveralls

[Bishoywadea]

@0xgouda i think it is ready now, unless you need to implement new panels other than the already exiting ones in pg dashboard