chore: migrate to ruff linting and formatting

[roshii]

Migrate to ruff linting and formatting. Formatting solely enforced to ./src to limit review burden.

I understand this PR is opinionated, opening it as a base for discussion. Hopefully everyone will agree that formatting is cumbersome and should be left to automation.

[3nprob]

Would something like this still pass?

Suggested change

	if (
	re.compile(r"^[0-9]{1,8}(\.)?([0-9]{1,8})?(btc|sat)?$").match(
	amount_str.lower()
	)
	is None
	):
	if re.compile(
	r"^[0-9]{1,8}(\.)?([0-9]{1,8})?(btc|sat)?$"
	).match(amount_str.lower()) is None:

or

Suggested change

	if (
	re.compile(r"^[0-9]{1,8}(\.)?([0-9]{1,8})?(btc|sat)?$").match(
	amount_str.lower()
	)
	is None
	):
	if re.compile(
	r"^[0-9]{1,8}(\.)?([0-9]{1,8})?(btc|sat)?$"
	).match(
	amount_str.lower()
	) is None:

[roshii]

I assume ruff would reformat as is. Unless you can find the appropriate option, but it doesn't look like it according to docs