Added get pending tx in query api

[Mingela]

Signed-off-by: Mingela freekilluau@gmail.com

[codecov-io]

Codecov Report

Merging #31 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master      #31     +/-   ##
===========================================
+ Coverage     74.77%   75.08%   +0.3%     
  Complexity      334      334             
===========================================
  Files            38       38             
  Lines          1471     1477      +6     
  Branches         34       34             
===========================================
+ Hits           1100     1109      +9     
+ Misses          297      294      -3     
  Partials         74       74

Impacted Files	Coverage Δ	Complexity Δ
...main/java/jp/co/soramitsu/iroha/java/QueryAPI.java	89.41% <100%> (+0.8%)	17 <1> (+1)	⬆️
...oha/java/detail/TransactionStatusObserverFace.java	18.18% <0%> (-9.1%)	2% <0%> (-1%)
...roha/java/debug/TestTransactionStatusObserver.java	50% <0%> (-5.56%)	15% <0%> (-2%)
...jp/co/soramitsu/iroha/java/TransactionBuilder.java	85.38% <0%> (+0.76%)	38% <0%> (+1%)	⬆️
.../java/jp/co/soramitsu/iroha/java/QueryBuilder.java	54.86% <0%> (+3.47%)	18% <0%> (+1%)	⬆️

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