reduce syscall by combing publish sequence into one write

[gftea]

according to the AMQP protocol, publish content is done in 3 frames: Publish + Header + Body. Current implementation make one write per frame. This is to make one write for all 3 frames of a publish so that reducing syscalls.

[codecov]

Codecov Report

Merging #33 (675e268) into main (9ea15f7) will decrease coverage by 0.01%.
The diff coverage is 84.37%.

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   84.11%   84.11%   -0.01%     
==========================================
  Files          42       42              
  Lines        5629     5639      +10     
==========================================
+ Hits         4735     4743       +8     
- Misses        894      896       +2     

Impacted Files	Coverage Δ
amqprs/src/net/reader_handler.rs	67.76% <ø> (ø)
amqprs/src/frame/mod.rs	84.78% <71.42%> (ø)
amqprs/src/net/split_connection.rs	92.96% <85.71%> (-0.35%)	⬇️
amqprs/src/api/channel/basic.rs	86.57% <100.00%> (-0.16%)	⬇️
amqprs/src/frame/content_header.rs	80.52% <100.00%> (ø)
amqprs/src/api/error.rs	33.33% <0.00%> (-11.12%)	⬇️
amqprs/src/api/channel/dispatcher.rs	88.88% <0.00%> (+1.66%)	⬆️

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