Customizable timeout in workers

[youben11]

Description

Related to #3714 , we needed a mechanism to use a larger timeout when we know how much the computation will take. This PR gives the ability for experienced users to use a different timeout rather than the default which is 60 seconds.

Checklist

• I have followed the Contribution Guidelines and Code of Conduct
• I have commented my code following the OpenMined Styleguide
• I have labeled this PR with the relevant Type labels
• My changes are covered by tests

[codecov]

Codecov Report

Merging #3760 into master will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3760      +/-   ##
==========================================
+ Coverage   94.72%   94.74%   +0.01%     
==========================================
  Files         186      186              
  Lines       18459    18460       +1     
==========================================
+ Hits        17486    17490       +4     
+ Misses        973      970       -3     

Impacted Files	Coverage Δ
syft/workers/node_client.py	30.00% <ø> (ø)
syft/workers/websocket_client.py	54.42% <66.66%> (+0.31%)	⬆️
syft/execution/plan.py	94.06% <0.00%> (-0.60%)	⬇️
syft/generic/pointers/object_pointer.py	82.22% <0.00%> (+3.70%)	⬆️

[gmuraru]

LGTM!