feat: move codecov-cli to uv to simplify dependency management and build APIs

[spalmurray]

I did try out uv workspaces to manage both with uv commands from the project root, but I found it a bit blah without totally changing the project structure. We can revisit that later if we want. For now the output of this is moving codecov-cli to uv for dependency management and build.

README overhaul to come later with documentation of the commands here. Just trying to get our builds published first.

Next PR will update the build and publish workflows, resolving the issue we ran into on thursday.

[codecov]

❌ 10 Tests Failed:

Tests completed	Failed	Passed	Skipped
6870	10	6860	10

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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[thomasrockhu-codecov]

can you add pip install uv or equivalent to the ./install.sh script?