Split suspendUntilConnectionState into specialized functions

[twyatt]

Having a function specific for suspension while waiting for connect and disconnect allowed for more informative logging and more readable code.

For example, reaching a disconnected state is only a failure while suspending until a connected state (so it just complicated the function when the function was used for disconnect).

[codecov]

Codecov Report

Merging #70 into develop will increase coverage by 0.05%.
The diff coverage is 92.00%.

@@              Coverage Diff              @@
##             develop      #70      +/-   ##
=============================================
+ Coverage      83.18%   83.23%   +0.05%     
- Complexity        55       57       +2     
=============================================
  Files             14       14              
  Lines            339      352      +13     
  Branches          32       34       +2     
=============================================
+ Hits             282      293      +11     
  Misses            48       48              
- Partials           9       11       +2     

Impacted Files	Coverage Δ	Complexity Δ
core/src/main/java/gatt/GattConnection.kt	100.00% <ø> (ø)	0.00 <0.00> (ø)
core/src/main/java/device/CoroutinesDevice.kt	96.77% <90.90%> (-3.23%)	5.00 <1.00> (+1.00)	⬇️
core/src/main/java/gatt/CoroutinesGatt.kt	58.82% <92.85%> (+11.45%)	11.00 <1.00> (+1.00)