Allow default requests parameters like proxy to be defined in extra options field of a Airflow HTTP Connection

[dabla]

---

^ Add meaningful description above
Read the Pull Request Guidelines for more information.
In case of fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in a newsfragment file, named {pr_number}.significant.rst or {issue_number}.significant.rst, in newsfragments.

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contribution Guide (https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst)
Here are some useful points:

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[Taragolis]

Also required to update the documentation for the connection:

airflow/docs/apache-airflow-providers-http/connections/http.rst

Lines 56 to 57 in d7bc217

	Extras (optional)
	Specify headers in json format.

[dabla]

Also required to update the documentation for the connection:

airflow/docs/apache-airflow-providers-http/connections/http.rst

Lines 56 to 57 in d7bc217

	Extras (optional)
	Specify headers in json format.

I've updated the documentation. Thank you for letting me know :)

[dirrao]

I see some checks are failing. Can you check and fix them?
I would suggest to install pre-commit hook for static checks.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwi4lubf1tWDAxWISWwGHdq7APoQFnoECA4QAQ&url=https%3A%2F%2Fgithub.com%2Fapache%2Fairflow%2Fblob%2Fmain%2FSTATIC_CODE_CHECKS.rst&usg=AOvVaw3_chGWjXp6V2QRaCTm_fyE&opi=89978449

[dabla]

I see some checks are failing. Can you check and fix them? I would suggest to install pre-commit hook for static checks. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwi4lubf1tWDAxWISWwGHdq7APoQFnoECA4QAQ&url=https%3A%2F%2Fgithub.com%2Fapache%2Fairflow%2Fblob%2Fmain%2FSTATIC_CODE_CHECKS.rst&usg=AOvVaw3_chGWjXp6V2QRaCTm_fyE&opi=89978449

Normally failing checks should be fixed now, thanks for the suggestion will look into that :)

[jscheffl]

Just a small type checking glitch, I assume then we are ready to merge :-D

[dabla]

Just a small type checking glitch, I assume then we are ready to merge :-D

Fixed it, my pre-commit hook isn't fully working yet (on Windows) but almost there (I think)