feat: reduce overhead to dispatch method handlers

[codecov[bot]]

Codecov Report

Patch coverage: 89.65% and project coverage change: -0.14% :warning:

Comparison is base (5d6f90b) 82.81% compared to head (4197337) 82.68%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #227 +/- ## ========================================== - Coverage 82.81% 82.68% -0.14% ========================================== Files 27 27 Lines 3241 3251 +10 Branches 672 673 +1 ========================================== + Hits 2684 2688 +4 - Misses 341 345 +4 - Partials 216 218 +2 ``` | [Files Changed](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/227?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/227?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/service.py](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/227?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2RidXNfZmFzdC9zZXJ2aWNlLnB5) | `87.97% <0.00%> (-0.69%)` | :arrow_down: | | [src/dbus\_fast/message\_bus.py](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/227?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2RidXNfZmFzdC9tZXNzYWdlX2J1cy5weQ==) | `72.64% <87.50%> (+0.40%)` | :arrow_up: | | [src/dbus\_fast/aio/message\_bus.py](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/227?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2RidXNfZmFzdC9haW8vbWVzc2FnZV9idXMucHk=) | `86.30% <100.00%> (+0.58%)` | :arrow_up: | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/Bluetooth-Devices/dbus-fast/pull/227/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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