fix: invalidate reserved namespace ids in ValidateBasic

[rootulp]

Closes informalsystems/audit-celestia#2

[codecov-commenter]

Codecov Report

Merging #643 (99c0ca0) into main (24bbf82) will increase coverage by 8.67%.
The diff coverage is 75.20%.

@@            Coverage Diff             @@
##             main     #643      +/-   ##
==========================================
+ Coverage   29.78%   38.45%   +8.67%     
==========================================
  Files          16       19       +3     
  Lines        2055     2538     +483     
==========================================
+ Hits          612      976     +364     
- Misses       1382     1476      +94     
- Partials       61       86      +25     

Impacted Files	Coverage Δ
pkg/shares/shares.go	50.00% <50.00%> (ø)
pkg/shares/share_splitting.go	75.00% <75.00%> (ø)
pkg/shares/share_merging.go	77.11% <77.11%> (ø)
x/payment/types/payfordata.go	77.20% <100.00%> (+1.85%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[evan-forbes]

thanks again for fixing this so quickly 🙂