make an option to start WAL Completer externally

[kptfh]

make an option to start WAL Completer externally and suspend and resume it manually

[codecov-io]

Codecov Report

Merging #50 into develop will decrease coverage by 0.82%.
The diff coverage is 76%.

@@              Coverage Diff              @@
##             develop      #50      +/-   ##
=============================================
- Coverage      88.14%   87.32%   -0.83%     
- Complexity       218      219       +1     
=============================================
  Files             23       23              
  Lines            751      765      +14     
  Branches          65       68       +3     
=============================================
+ Hits             662      668       +6     
- Misses            58       63       +5     
- Partials          31       34       +3

Impacted Files	Coverage Δ	Complexity Δ
...raph/aerospike/operations/AerospikeOperations.java	88.46% <ø> (ø)	13 <0> (ø)	⬇️
...nusgraph/aerospike/operations/BasicOperations.java	97.61% <100%> (ø)	21 <0> (ø)	⬇️
...m/playtika/janusgraph/aerospike/ConfigOptions.java	92.85% <100%> (+1.19%)	1 <0> (ø)	⬇️
...ka/janusgraph/aerospike/AerospikeStoreManager.java	81.66% <50%> (-1.39%)	16 <0> (ø)
.../aerospike/transaction/WriteAheadLogCompleter.java	79.54% <54.54%> (-3.58%)	15 <6> (+2)
...raph/aerospike/operations/BasicLockOperations.java	85.1% <0%> (-1.42%)	37% <0%> (-1%)

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