[hi] Add tests and fix errors in csv parser

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Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +4.77% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (58d4706ad04f1ebc9601f4ea0a1fff13387daf22) | 436 | 401 | 91.97% | | | Head commit (670a035c29b33ed04973777f65148e123f681288) | 1073 (+637) | 1038 (+637) | 96.74% (**+4.77%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#45) | 618 | 618 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
src/chainreport_parser/hi_parser_csv.py	100.00% <100.00%> (ø)
tests/hi_parser_csv_test.py	100.00% <100.00%> (ø)