fix: Remove per-message byte limit in client

[dpcollins-google]

There still exists a 3.5MiB byte limit server side, and a protocol level 4MiB message limit.

[codecov]

Codecov Report

Merging #435 (c7d9d52) into master (9df4ccf) will increase coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #435      +/-   ##
============================================
+ Coverage     71.22%   71.34%   +0.11%     
- Complexity      905      906       +1     
============================================
  Files           167      167              
  Lines          4789     4781       -8     
  Branches        242      239       -3     
============================================
  Hits           3411     3411              
+ Misses         1240     1233       -7     
+ Partials        138      137       -1     

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/google/cloud/pubsublite/Constants.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../cloud/pubsublite/internal/wire/PublisherImpl.java	88.88% <ø> (+6.13%)	21.00 <0.00> (ø)

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