Syncing perf_coll_fw_enhance feature branch to master

[NajmudheenCT]

What this PR does / why we need it:
Merge feature branch to master which has

• Localised job scheduling
• Centralised job distribution

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #669 #670

Special notes for your reviewer:
PRs has been reviewed and tested in feature branch
below are the summary of different scenarios tested with this branch

1. Storage registration
2. Storage deletion
3. Worker node up
4. worker node down
5. Leader node up
6. Leader node down
7. Collection failure handling
8. Task restart
9. Leader switch

Detailed TCs are available here

Release note:

[codecov]

Codecov Report

Merging #692 (2c8cee5) into master (cdbaf38) will decrease coverage by 0.24%.
The diff coverage is 59.76%.

@@            Coverage Diff             @@
##           master     #692      +/-   ##
==========================================
- Coverage   70.97%   70.72%   -0.25%     
==========================================
  Files         157      161       +4     
  Lines       15347    15560     +213     
  Branches     1928     1934       +6     
==========================================
+ Hits        10892    11005     +113     
- Misses       3814     3906      +92     
- Partials      641      649       +8     

Impacted Files	Coverage Δ
delfin/cmd/task.py	0.00% <0.00%> (ø)
delfin/common/config.py	95.00% <ø> (ø)
...in/leader_election/distributor/perf_job_manager.py	0.00% <0.00%> (ø)
delfin/leader_election/factory.py	43.75% <0.00%> (-2.92%)	⬇️
delfin/task_manager/manager.py	0.00% <ø> (ø)
delfin/task_manager/metrics_manager.py	0.00% <0.00%> (ø)
delfin/task_manager/tasks/telemetry.py	71.42% <ø> (+0.59%)	⬆️
delfin/task_manager/metrics_rpcapi.py	50.00% <50.00%> (ø)
delfin/task_manager/scheduler/schedule_manager.py	66.66% <57.14%> (+11.11%)	⬆️
delfin/task_manager/perf_job_controller.py	61.29% <61.29%> (ø)
... and 19 more

[sushanthakumar]

LGTM

[wisererik]

LGTM

[kumarashit]

LGTM