Fix handling files with unicode names or contents

[Swatinem]

This adds the git ls-files which instructs git to output files separated by \0, and otherwise output filenames verbatim without any special encoding.

The second fix is related to enforcing utf-8 encoding when reading in file contents in order to produce "file fixes".

---

Fixes #489, fixes codecov/codecov-action#1550, fixes codecov/codecov-action#1539

[codecov]

❌ 5 Tests Failed:

Tests completed	Failed	Passed	Skipped
3590	5	3585	0

View the top 3 failed test(s) by shortest run time

api.temp.calculator.test_calculator::test_divide

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

api.temp.calculator.test_calculator::test_divide

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

api.temp.calculator.test_calculator::test_divide

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

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[github-actions]

✅ All tests successful. No failed tests were found.

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