make json-rpc public by default

[Vritra4]

like lcd and rpc, making json-rpc public sounds reasonable to me.
if it is weird or dangerous, please feel free to close this pr :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.05%. Comparing base (fb6e4c8) to head (ecca3c5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   27.05%   27.05%           
=======================================
  Files         100      100           
  Lines       11109    11109           
=======================================
  Hits         3006     3006           
  Misses       7685     7685           
  Partials      418      418           

Files	Coverage Δ
jsonrpc/config/config.go	0.00% <ø> (ø)

[beer-1]

If we have no plan to support personal apis, then it should be okay.

[Vritra4]

close this: we have no plan i guess :)