SKALE-4983 add limit for message and test

[payvint]

Make a limit of 1024 bytes for message

[codecov]

Codecov Report

Merging #1033 (e654ec1) into develop (657425e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head e654ec1 differs from pull request most recent head cce9bf7. Consider uploading reports for the commit cce9bf7 to get more accurate results

@@             Coverage Diff             @@
##           develop    #1033      +/-   ##
===========================================
+ Coverage    87.11%   87.12%   +0.01%     
===========================================
  Files           24       24              
  Lines         1063     1064       +1     
  Branches       282      283       +1     
===========================================
+ Hits           926      927       +1     
  Misses          47       47              
  Partials        90       90              

Impacted Files	Coverage Δ
proxy/contracts/MessageProxy.sol	100.00% <100.00%> (ø)

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