feat: speed up unmarshaller

[codecov[bot]]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.10% :warning:

Comparison is base (98c7e75) 83.38% compared to head (e23bd60) 83.29%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #250 +/- ## ========================================== - Coverage 83.38% 83.29% -0.10% ========================================== Files 28 28 Lines 3263 3263 Branches 677 677 ========================================== - Hits 2721 2718 -3 - Misses 328 330 +2 - Partials 214 215 +1 ``` | [Files Changed](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/250?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices) | Coverage Δ | | |---|---|---| | [src/dbus\_fast/\_\_version\_\_.py](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/250?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2RidXNfZmFzdC9fX3ZlcnNpb25fXy5weQ==) | `0.00% <0.00%> (ø)` | | | [src/dbus\_fast/\_private/unmarshaller.py](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/250?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2RidXNfZmFzdC9fcHJpdmF0ZS91bm1hcnNoYWxsZXIucHk=) | `94.73% <ø> (-0.24%)` | :arrow_down: | | [src/dbus\_fast/aio/message\_reader.py](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/250?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2RidXNfZmFzdC9haW8vbWVzc2FnZV9yZWFkZXIucHk=) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/250/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices)

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