Change keystores passwords to chararray

[namtruong]

Update ssl keystore/truststore password fields also to use char[] instead of string.

An addition to previous PR #1041 and issue #792

[codecov-io]

Codecov Report

Merging #1046 into master will increase coverage by 0.00%.
The diff coverage is 98.48%.

@@            Coverage Diff            @@
##             master    #1046   +/-   ##
=========================================
  Coverage     99.42%   99.43%           
- Complexity     2291     2296    +5     
=========================================
  Files           348      349    +1     
  Lines          6307     6327   +20     
  Branches        363      365    +2     
=========================================
+ Hits           6271     6291   +20     
  Misses            5        5           
  Partials         31       31           

Flag	Coverage Δ	Complexity Δ
#unittests	99.43% <98.48%> (+<0.01%)	2296.00 <36.00> (+5.00)

Impacted Files	Coverage Δ	Complexity Δ
...m/quorum/tessera/config/builder/ConfigBuilder.java	100.00% <ø> (ø)	39.00 <0.00> (ø)
...main/java/com/quorum/tessera/config/SslConfig.java	100.00% <ø> (ø)	48.00 <0.00> (ø)
...tessera/config/constraints/SslConfigValidator.java	97.80% <95.74%> (+0.21%)	58.00 <11.00> (ø)
...orum/tessera/config/adapters/CharArrayAdapter.java	100.00% <100.00%> (ø)	5.00 <5.00> (?)
...quorum/tessera/config/util/ConfigSecretReader.java	100.00% <100.00%> (ø)	5.00 <0.00> (ø)
...m/tessera/config/util/EncryptedStringResolver.java	91.66% <100.00%> (ø)	4.00 <0.00> (ø)
...ssera/ssl/context/ClientSSLContextFactoryImpl.java	100.00% <100.00%> (ø)	8.00 <7.00> (ø)
.../quorum/tessera/ssl/context/SSLContextBuilder.java	100.00% <100.00%> (ø)	14.00 <4.00> (ø)
.../quorum/tessera/ssl/context/SSLKeyStoreLoader.java	100.00% <100.00%> (ø)	15.00 <1.00> (ø)
...ssera/ssl/context/ServerSSLContextFactoryImpl.java	100.00% <100.00%> (ø)	8.00 <7.00> (ø)
... and 3 more

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