feat: add ability to set the bind key after init

[bdraco]

BREAKING CHANGE: the bindkey should no longer be set directly on the object, call set_bindkey instead

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.09 :tada:

Comparison is base (e6c192c) 77.66% compared to head (85a0672) 77.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #83 +/- ## ========================================== + Coverage 77.66% 77.75% +0.09% ========================================== Files 6 6 Lines 479 481 +2 Branches 72 72 ========================================== + Hits 372 374 +2 Misses 83 83 Partials 24 24 ``` | [Impacted Files](https://app.codecov.io/gh/Bluetooth-Devices/bthome-ble/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices) | Coverage Δ | | |---|---|---| | [src/bthome\_ble/\_\_init\_\_.py](https://app.codecov.io/gh/Bluetooth-Devices/bthome-ble/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2J0aG9tZV9ibGUvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | | | [src/bthome\_ble/parser.py](https://app.codecov.io/gh/Bluetooth-Devices/bthome-ble/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bluetooth-Devices#diff-c3JjL2J0aG9tZV9ibGUvcGFyc2VyLnB5) | `83.71% <100.00%> (+0.10%)` | :arrow_up: |

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