feat: knex instrumentation

[rauno56]

Which problem is this PR solving?

This adds auto-instrumentation for knex.

Short description of the changes

It emits spans from SQL queries regardless of the driver. Knex makes its query builder a custom thenable instance so await knex(table)... executes the query. Elegant API, but it is a lost cause for context propagation. To battle this I'm storing context before possible awaits and use that as a parent in the query method.

[rauno56]

... adding a feature for limiting the length of the statement.

[codecov]

Codecov Report

Merging #506 (7ace5d8) into main (c7df125) will not change coverage.
The diff coverage is n/a.

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  Coverage   94.84%   94.84%           
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  Files         152      152           
  Lines        9226     9226           
  Branches      918      918           
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  Hits         8750     8750           
  Misses        476      476           

[vmarchaud]

lgtm

[rauno56]

Thanks, @blumamir, I think I addressed everything!

[dyladan]

Will wait for @blumamir approval before merging this since he was the most involved approver

[blumamir]

Will wait for @blumamir approval before merging this since he was the most involved approver

Added few more minor comments, but overall LGTM.
I don't want to hold the PR, but was reviewing it by just browsing the code. Didn't actually run it in a real environment.
If not urgent, I can find time tomorrow to play with it on my setup.
But that's completely optional - can be skiped if you want to merge it already for the v0.20.0 release.

[blumamir]

Will wait for @blumamir approval before merging this since he was the most involved approver

Added few more minor comments, but overall LGTM.
I don't want to hold the PR, but was reviewing it by just browsing the code. Didn't actually run it in a real environment.
If it's not urgent, I can find time tomorrow to play with it on my setup.
But that's completely optional - can be skiped it if you want to merge it already for the v0.20.0 release.

oops, see now that contrib v0.20.0 was already released yesterday. thought it was still in proposal.

[blumamir]

Tested it locally, works great :) thanks @rauno56 good job.
Beside from the few minor open comments that I added, I think it's good to go.