Adjust Exception hierarchy

[twyatt]

• Changed all but NotReady to extend from IOException
• Marked all Exception constructors as internal
• Removed GattResponseFailure
  • Correctly throwing ConnectionLost instead (as was described in KDoc @throws)
• Renamed GattStatusFailure to GattErrorStatus

Exception hierarchy

core

• IOException
  • ConnectionLost
  • OutOfOrderGattCallback
  • GattErrorStatus

keep-alive

• IllegalStateException
  • NotReady
• IOException
  • ConnectionRejected

[codecov[bot]]

Codecov Report

Merging #69 into develop will increase coverage by 0.04%. The diff coverage is 90.90%.

@@              Coverage Diff              @@
##             develop      #69      +/-   ##
=============================================
+ Coverage      83.13%   83.18%   +0.04%     
  Complexity        55       55              
=============================================
  Files             14       14              
  Lines            338      339       +1     
  Branches          32       32              
=============================================
+ Hits             281      282       +1     
  Misses            48       48              
  Partials           9        9              

Impacted Files	Coverage Δ	Complexity Δ
core/src/main/java/gatt/GattIo.kt	100.00% <ø> (ø)	0.00 <0.00> (ø)
...ow/src/main/java/android/BluetoothDeviceOrThrow.kt	100.00% <ø> (ø)	0.00 <0.00> (ø)
core/src/main/java/gatt/CoroutinesGatt.kt	47.36% <50.00%> (-2.64%)	10.00 <0.00> (ø)
core/src/main/java/gatt/GattConnection.kt	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
keep-alive/src/main/java/KeepAliveGatt.kt	90.47% <100.00%> (ø)	19.00 <0.00> (ø)