feat: HTTP server for dead job management

[sudo-suhas]

• Add dead job management handler with endpoints for dead job management:
  • /dead-jobs: JSON/HTML response with content negotiation. Response is paginated.
  • /resurrect-jobs: Move specified dead jobs to jobs_queue table.
  • /clear-jobs: Remove specified dead jobs from dead_jobs table.
• Start a HTTP server on specified job manager port when worker is run.

[coveralls]

Pull Request Test Coverage Report for Build 5666236009

• 156 of 183 (85.25%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 87.69%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/workermanager/worker_manager.go	14	16	87.5%
pkg/worker/pgq/pgq_utils.go	23	27	85.19%
pkg/worker/dead_jobs_handler.go	71	78	91.03%
pkg/worker/pgq/pgq_processor.go	48	62	77.42%
<!--	Total:	156	183	85.25%	-->

Totals
Change from base Build 5640955468:	-0.07%
Covered Lines:	5955
Relevant Lines:	6791

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💛 - Coveralls