Use futures::Pool in broadcast::linked

[BrendanChou]

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[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.72%. Comparing base (2c0b42e) to head (e2589b9).

Files with missing lines	Patch %	Lines
broadcast/src/linked/signer/actor.rs	80.00%	2 Missing ⚠️

@@            Coverage Diff             @@
##           bc/res     #500      +/-   ##
==========================================
+ Coverage   93.68%   93.72%   +0.03%     
==========================================
  Files         112      112              
  Lines       30437    30424      -13     
==========================================
- Hits        28515    28514       -1     
+ Misses       1922     1910      -12     

Files with missing lines	Coverage Δ
broadcast/src/linked/mod.rs	99.26% <100.00%> (ø)
broadcast/src/linked/signer/actor.rs	90.12% <80.00%> (-0.41%)	⬇️

... and 3 files with indirect coverage changes

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