feat: Add missing NCCO fields

[SMadani]

A fair few fields are not present in the NCCO actions in com.vonage.client.voice.ncco. This PR updates them to be consistent with the NCCO reference documentation, along with improved documentation. It also achieves 100% coverage for Voice, since the VoiceResponseException wasn't covered in VoiceClientTest.

[codecov-commenter]

Codecov Report

Merging #510 (7967b67) into main (b5179f6) will increase coverage by 0.11%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #510      +/-   ##
============================================
+ Coverage     95.21%   95.33%   +0.11%     
- Complexity     2895     2934      +39     
============================================
  Files           427      428       +1     
  Lines          6880     6983     +103     
  Branches        393      407      +14     
============================================
+ Hits           6551     6657     +106     
+ Misses          201      198       -3     
  Partials        128      128              

Files	Coverage Δ
...va/com/vonage/client/voice/ncco/ConnectAction.java	100.00% <100.00%> (ø)
...m/vonage/client/voice/ncco/ConversationAction.java	100.00% <100.00%> (ø)
...java/com/vonage/client/voice/ncco/InputAction.java	100.00% <ø> (ø)
...ava/com/vonage/client/voice/ncco/NotifyAction.java	100.00% <100.00%> (ø)
...ava/com/vonage/client/voice/ncco/RecordAction.java	100.00% <100.00%> (ø)
...a/com/vonage/client/voice/ncco/SpeechSettings.java	100.00% <100.00%> (ø)
...onage/client/voice/ncco/TranscriptionSettings.java	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes