test(bug): In TestAdvancedKeyManagement, check if can get the imported key by address

[jefft0]

This PR demonstrates a bug. TestAdvancedKeyManagement makes an in-memory Keybase, creates a key and tests Export and Import. It appears that Import sets the lookup by name, but not lookup by address. To demonstrate, this PR makes a new in-memory Keybase, imports the same key, and does GetByName to show a successful import. Then it does GetByAddress which should succeed but it fails.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.23%. Comparing base (04d5239) to head (6fd2289).
Report is 72 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2718   +/-   ##
=======================================
  Coverage   60.23%   60.23%           
=======================================
  Files         562      562           
  Lines       75091    75091           
=======================================
+ Hits        45230    45233    +3     
+ Misses      26481    26478    -3     
  Partials     3380     3380           

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contribs/gnofaucet	15.31% <ø> (ø)
gno.land	64.76% <ø> (ø)
gnovm	64.33% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	20.23% <ø> (+0.35%)	⬆️

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