Create Backend Config Manager

[Brain256]

Purpose

Closes #335
Create a BackendConfiguration class to store backend config info (logger excluded params and CORS config settings)

New Changes

• added .*.env to the .gitignore
• created Pydantic classes to represent CORS and logger configurations
• created a BackendConfiguration class to store CORS and logger config settings
• changed middleware and setup files to take info from an instance of the BackendConfiguration class

Testing

Explain tests that you ran to verify code functionality.

• I have unit-tested this PR. Otherwise, explain why it cannot be unit-tested.
• I have included screenshots of the tests performed below.

Outstanding Changes

If there are non-critical changes (i.e. additional features) that can be made to this feature in the future, indicate them here.

[github-actions]

Pull reviewers stats

Stats of the last 120 days for UWOrbital:

	User	Total reviews	Time to review	Total comments
	Adityya-K 🥇	56 ▀▀▀▀▀	1d 4h 3m	180 ▀▀▀▀
	camspec 🥈	27 ▀▀▀	1d 16h 6m	168 ▀▀▀▀
	kepler452b123 🥉	15 ▀	6d 7h 42m ▀	38 ▀
	Yarik-Popov	4	1d 1h 41m	40 ▀
	proprogrammer504	2	7d 1h 31m ▀▀	7
	Navtajh04	1	1d 3h 20m	0
	sunray4	1	12d 21m ▀▀▀	9
	c4bae	1	13d 1h 35m ▀▀▀	2

^{⚡️ Pull request stats}

[camspec]

Very well done! Some small comments and this looks good to me

[camspec]

LGTM!

[camspec]

LGTM!