[TEST] Add serialisation tests

[eseiler]

Resolves #164

include/hibf/cereal/path.hpp was missing the cereal/types/string.hpp include to compile

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Name	Status	Preview	Comments	Updated (UTC)
hibf	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 8, 2023 4:33pm

[codecov[bot]]

Codecov Report

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

Comparison is base (c486df3) 99.94% compared to head (af5cf81) 99.94%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #165 +/- ## ======================================= Coverage 99.94% 99.94% ======================================= Files 44 45 +1 Lines 1776 1796 +20 ======================================= + Hits 1775 1795 +20 Misses 1 1 ``` | [Files](https://app.codecov.io/gh/seqan/hibf/pull/165?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan) | Coverage Δ | | |---|---|---| | [include/hibf/cereal/path.hpp](https://app.codecov.io/gh/seqan/hibf/pull/165?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-aW5jbHVkZS9oaWJmL2NlcmVhbC9wYXRoLmhwcA==) | `100.00% <ø> (ø)` | | | [include/hibf/config.hpp](https://app.codecov.io/gh/seqan/hibf/pull/165?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-aW5jbHVkZS9oaWJmL2NvbmZpZy5ocHA=) | `100.00% <100.00%> (ø)` | |

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