Add exclude urls feature to HTTPX instrumentation

[jomasti]

Is your feature request related to a problem?
This is to add the exclude urls functionality to the HTTPX instrumentation. This is a follow-up for #461.

Describe the solution you'd like
The solution should allow for skipping instrumentation for a list of excluded URLs similar to the current solutions.

[zqumei0]

Hi, can you assign this issue to me? Thanks in advance!

[srikanthccv]

Feel free to ask questions here or on Slack channel/DM if you need any help.

[macieyng]

Hi @zqumei0 👋 Is there any progress? Did you worked on it? Do you need any support? I'm willing to work on this too.

[zqumei0]

Hey @macieyng! Yes I have made some progress with this, but I can sync up with you on Slack with what I currently have and see how to move forward if you're good with that.

[macieyng]

Sure. My nick on slack is the same as here.

Meanwhile, please create a pull request (it can be a draft) with what you've got so far and link it with this issue.