WIP feat(code_mapping): Support single file

[armenzg]

This is very WIP. It's only a start.

[codecov]

❌ 10 Tests Failed:

Tests completed	Failed	Passed	Skipped
24649	10	24639	317

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

tests.sentry.issues.auto_source_code_config.test_code_mapping.TestFrameInfo::test_raises_unsupported

Stack Traces | 0.041s run time

#x1B[1m#x1B[.../issues/auto_source_code_config/test_code_mapping.py#x1B[0m:118: in test_raises_unsupported
    FrameInfo({"filename": filepath})
#x1B[1m#x1B[.../issues/auto_source_code_config/code_mapping.py#x1B[0m:106: in __init__
    raise NeedsExtension("It needs an extension.")
#x1B[1m#x1B[31mE   sentry.issues.auto_source_code_config.code_mapping.NeedsExtension: It needs an extension.#x1B[0m

tests.sentry.issues.auto_source_code_config.test_code_mapping::test_buckets_logic

Stack Traces | 0.041s run time

#x1B[1m#x1B[.../issues/auto_source_code_config/test_code_mapping.py#x1B[0m:101: in test_buckets_logic
    assert buckets == {
#x1B[1m#x1B[.../issues/auto_source_code_config/code_mapping.py#x1B[0m:103: in __init__
    raise UnsupportedFrameInfo("This path is not supported.")
#x1B[1m#x1B[31mE   sentry.issues.auto_source_code_config.code_mapping.UnsupportedFrameInfo: This path is not supported.#x1B[0m

tests.sentry.issues.auto_source_code_config.test_code_mapping.TestFrameInfo::test_straight_path_prefix[../../../../../../packages/something.py-../../../../../../packages]

Stack Traces | 0.054s run time

#x1B[1m#x1B[.../issues/auto_source_code_config/test_code_mapping.py#x1B[0m:204: in test_straight_path_prefix
    frame_info = FrameInfo({"filename": frame_filename})
#x1B[1m#x1B[.../issues/auto_source_code_config/code_mapping.py#x1B[0m:103: in __init__
    raise UnsupportedFrameInfo("This path is not supported.")
#x1B[1m#x1B[31mE   sentry.issues.auto_source_code_config.code_mapping.UnsupportedFrameInfo: This path is not supported.#x1B[0m

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