fix: Add more account check

[cindyyan317]

Make sure all char is alphanumeric for account

[godexsoft]

Code looks good 👍 Need to fix the formatting on the doxygen and we are good to go 🚀

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.52%. Comparing base (46a616c) to head (ae7e1a9).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
src/rpc/handlers/GatewayBalances.hpp	0.00%	0 Missing and 2 partials ⚠️
src/rpc/handlers/LedgerEntry.hpp	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1543      +/-   ##
===========================================
+ Coverage    68.48%   68.52%   +0.03%     
===========================================
  Files          238      239       +1     
  Lines         9641     9654      +13     
  Branches      5349     5356       +7     
===========================================
+ Hits          6603     6615      +12     
+ Misses        1649     1648       -1     
- Partials      1389     1391       +2     

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