feat: start to port over test_hgvs_grammer_full.py (#21)

[codecov[bot]]

Codecov Report

Patch coverage: 97.43% and project coverage change: +0.08 :tada:

Comparison is base (7f925c8) 86.00% compared to head (e896ef1) 86.08%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #31 +/- ## ========================================== + Coverage 86.00% 86.08% +0.08% ========================================== Files 17 17 Lines 6195 6232 +37 ========================================== + Hits 5328 5365 +37 Misses 867 867 ``` | [Impacted Files](https://codecov.io/gh/bihealth/hgvs-rs/pull/31?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth) | Coverage Δ | | |---|---|---| | [src/parser/impl\_parse.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/31?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL3BhcnNlci9pbXBsX3BhcnNlLnJz) | `99.68% <97.43%> (-0.32%)` | :arrow_down: | | [src/mapper/variant.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/31?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL21hcHBlci92YXJpYW50LnJz) | `83.10% <0.00%> (-0.03%)` | :arrow_down: | | [src/parser/ds.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/31?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL3BhcnNlci9kcy5ycw==) | `64.31% <0.00%> (+0.44%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth)

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