Only print base64 string value for a key if public.

[melowe]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1092 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1092   +/-   ##
=========================================
  Coverage     99.39%   99.39%           
- Complexity     2263     2264    +1     
=========================================
  Files           350      350           
  Lines          6291     6298    +7     
  Branches        360      360           
=========================================
+ Hits           6253     6260    +7     
  Misses            5        5           
  Partials         33       33           

Flag	Coverage Δ	Complexity Δ
#unittests	99.39% <100.00%> (+<0.01%)	2264.00 <1.00> (+1.00)

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/quorum/tessera/encryption/BaseKey.java	100.00% <100.00%> (ø)	8.00 <0.00> (ø)
...a/com/quorum/tessera/encryption/PublicKeyImpl.java	100.00% <100.00%> (ø)	2.00 <1.00> (+1.00)

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