refactor: Type inference hack for fromJson

[SMadani]

This PR adds documentation to the Jsonable class, as well as an overload to infer the type using the varargs trick. It also removes the unused VonageApiResponseException.fromHttpResponse method, and standardises MessageStatus.fromJson.

[codecov-commenter]

Codecov Report

Merging #492 (8718d8a) into main (80a4cdc) will increase coverage by 0.05%. Report is 1 commits behind head on main. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #492      +/-   ##
============================================
+ Coverage     93.90%   93.95%   +0.05%     
+ Complexity     2593     2592       -1     
============================================
  Files           380      380              
  Lines          6532     6521      -11     
  Branches        431      430       -1     
============================================
- Hits           6134     6127       -7     
+ Misses          224      218       -6     
- Partials        174      176       +2     

Files	Coverage Δ
src/main/java/com/vonage/client/Jsonable.java	91.30% <100.00%> (+9.48%)	:arrow_up:
.../com/vonage/client/VonageApiResponseException.java	67.39% <100.00%> (+0.72%)	:arrow_up:
...ava/com/vonage/client/account/BalanceResponse.java	100.00% <100.00%> (ø)
...com/vonage/client/account/ListSecretsResponse.java	100.00% <100.00%> (ø)
...m/vonage/client/account/PrefixPricingResponse.java	100.00% <100.00%> (ø)
...ava/com/vonage/client/account/PricingResponse.java	100.00% <100.00%> (ø)
...java/com/vonage/client/account/SecretResponse.java	100.00% <100.00%> (ø)
...va/com/vonage/client/account/SettingsResponse.java	100.00% <100.00%> (ø)
...ava/com/vonage/client/application/Application.java	93.75% <100.00%> (ø)
...com/vonage/client/application/ApplicationList.java	75.00% <100.00%> (ø)
... and 45 more

... and 1 file with indirect coverage changes