Terminate Caliper workers on interrupting Caliper manager

[CaptainIRS]

In this PR:

• The SIGINT signal is handled in the manager to cleanly terminate workers when user tries to terminate Caliper manager.

Fixes #1361

[codecov[bot]]

Codecov Report

Merging #1435 (541f2ab) into main (64f3868) will decrease coverage by 0.03%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1435      +/-   ##
==========================================
- Coverage   55.56%   55.52%   -0.04%     
==========================================
  Files         103      103              
  Lines        4451     4454       +3     
  Branches      676      677       +1     
==========================================
  Hits         2473     2473              
- Misses       1435     1437       +2     
- Partials      543      544       +1     

Flag	Coverage Δ
caliper-core	44.26% <0.00%> (-0.05%)	:arrow_down:
caliper-fabric	80.46% <ø> (ø)
generator-caliper	83.62% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ackages/caliper-core/lib/manager/caliper-engine.js	7.05% <0.00%> (-0.18%)	:arrow_down:
...re/lib/manager/orchestrators/round-orchestrator.js	6.36% <0.00%> (-0.06%)	:arrow_down:

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