perf: further speeding up translate_cds code (#83)

[codecov[bot]]

Codecov Report

Patch coverage: 96.22% and project coverage change: +0.01 :tada:

Comparison is base (1e3a55d) 88.86% compared to head (fda8e1b) 88.87%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #85 +/- ## ========================================== + Coverage 88.86% 88.87% +0.01% ========================================== Files 19 19 Lines 7966 7976 +10 ========================================== + Hits 7079 7089 +10 Misses 887 887 ``` | [Impacted Files](https://codecov.io/gh/bihealth/hgvs-rs/pull/85?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth) | Coverage Δ | | |---|---|---| | [src/sequences.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/85?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL3NlcXVlbmNlcy5ycw==) | `99.40% <96.22%> (+<0.01%)` | :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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