g3proxy: add testcase for float escapers

[zh-jq-b]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 43.42%. Comparing base (33031c7) to head (d8b1c93).

Files with missing lines	Patch %	Lines
g3proxy/src/escape/direct_float/udp_relay/mod.rs	52.94%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
+ Coverage   42.51%   43.42%   +0.91%     
==========================================
  Files        1091     1091              
  Lines       98683    98696      +13     
==========================================
+ Hits        41952    42863     +911     
+ Misses      56731    55833     -898     

Flag	Coverage Δ
g3proxy	43.43% <60.00%> (+0.91%)	⬆️
lib	25.42% <ø> (ø)

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