added javadoc, removed unused exceptions

[mitch-lbw]

Closes #166 Closes #169

[codecov-commenter]

Codecov Report

Merging #217 (6101437) into 3.x (70422d1) will increase coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head 6101437 differs from pull request most recent head 615250d. Consider uploading reports for the commit 615250d to get more accurate results

@@             Coverage Diff              @@
##                3.x     #217      +/-   ##
============================================
+ Coverage     11.24%   11.27%   +0.03%     
  Complexity      150      150              
============================================
  Files           163      152      -11     
  Lines          3754     3743      -11     
  Branches        139      139              
============================================
  Hits            422      422              
+ Misses         3306     3295      -11     
  Partials         26       26              

Impacted Files	Coverage Δ
...krauts/aeternity/sdk/constants/ApiIdentifiers.java	100.00% <ø> (ø)
.../kryptokrauts/aeternity/sdk/constants/Network.java	70.00% <ø> (ø)
...auts/aeternity/sdk/domain/ObjectResultWrapper.java	0.00% <ø> (ø)
...auts/aeternity/sdk/domain/StringResultWrapper.java	0.00% <ø> (ø)
...nity/sdk/domain/secret/DeterministicHierarchy.java	76.56% <ø> (ø)
...sdk/domain/secret/DeterministicHierarchyEntry.java	82.60% <ø> (ø)
...okrauts/aeternity/sdk/domain/secret/HdKeyPair.java	80.00% <ø> (ø)
...tokrauts/aeternity/sdk/domain/secret/HdWallet.java	100.00% <ø> (ø)
...ptokrauts/aeternity/sdk/domain/secret/KeyPair.java	73.33% <ø> (ø)
...okrauts/aeternity/sdk/exception/AENSException.java	0.00% <0.00%> (ø)
... and 27 more

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[marc0olo]

generally looks good. have some suggestions and one question