Configurable deadlock detector interval for ingester.

[marqc]

Which problem is this PR solving?

• Resolves Ingester panics when no messages is processed in 1 minute #1125

Short description of the changes

• Additional configurable flag for ingester deadlock detector interval
• Value of 0 disables deadlock_detector

[codecov]

Codecov Report

Merging #1133 into master will decrease coverage by 0.13%.
The diff coverage is 70%.

@@            Coverage Diff             @@
##           master    #1133      +/-   ##
==========================================
- Coverage     100%   99.86%   -0.14%     
==========================================
  Files         142      142              
  Lines        6743     6758      +15     
==========================================
+ Hits         6743     6749       +6     
- Misses          0        3       +3     
- Partials        0        6       +6

Impacted Files	Coverage Δ
cmd/ingester/app/consumer/consumer.go	100% <100%> (ø)	⬆️
cmd/ingester/app/flags.go	91.66% <66.66%> (-8.34%)	⬇️
cmd/ingester/app/consumer/deadlock_detector.go	92.94% <70%> (-7.06%)	⬇️

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