Add method to pair with a device.

[qwandor]

Fixes #289.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 46.51%. Comparing base (eb39d2c) to head (1042172).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
bluez-async/src/lib.rs	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
- Coverage   46.73%   46.51%   -0.23%     
==========================================
  Files          28       28              
  Lines        2897     2911      +14     
  Branches     2897     2911      +14     
==========================================
  Hits         1354     1354              
- Misses       1485     1499      +14     
  Partials       58       58              

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