Add release notes for 1.11.0.0

[ohltyler]

Issue #, if available:

Description of changes:

Add release notes for 1.11.0.0. Will not merge until all PRs for this tag are finalized and merged.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #276 into master will decrease coverage by 1.76%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #276      +/-   ##
============================================
- Coverage     72.41%   70.65%   -1.77%     
- Complexity     1290     1778     +488     
============================================
  Files           139      186      +47     
  Lines          6073     8597    +2524     
  Branches        469      731     +262     
============================================
+ Hits           4398     6074    +1676     
- Misses         1464     2178     +714     
- Partials        211      345     +134     

Flag	Coverage Δ	Complexity Δ
#plugin	69.86% <ø> (-1.50%)	1778.00 <ø> (+488.00)	⬇️

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

Impacted Files	Coverage Δ	Complexity Δ
...sticsearch/ad/model/IntervalTimeConfiguration.java	63.63% <0.00%> (-36.37%)	8.00% <0.00%> (ø%)
...stroforelasticsearch/ad/model/AnomalyDetector.java	65.02% <0.00%> (-23.87%)	56.00% <0.00%> (+10.00%)	⬇️
...oforelasticsearch/ad/model/AnomalyDetectorJob.java	58.97% <0.00%> (-22.85%)	24.00% <0.00%> (+2.00%)	⬇️
...n/opendistroforelasticsearch/ad/model/Feature.java	76.36% <0.00%> (-19.10%)	13.00% <0.00%> (ø%)
...elasticsearch/ad/AnomalyDetectorProfileRunner.java	50.98% <0.00%> (-18.96%)	41.00% <0.00%> (+3.00%)	⬇️
...pendistroforelasticsearch/ad/ml/CheckpointDao.java	83.59% <0.00%> (-16.41%)	57.00% <0.00%> (+43.00%)	⬇️
...stroforelasticsearch/ad/util/RestHandlerUtils.java	84.21% <0.00%> (-15.79%)	13.00% <0.00%> (ø%)
...opendistroforelasticsearch/ad/ml/ModelManager.java	79.03% <0.00%> (-13.03%)	98.00% <0.00%> (-14.00%)
...rch/ad/transport/AnomalyResultTransportAction.java	66.92% <0.00%> (-11.55%)	56.00% <0.00%> (-3.00%)
...ticsearch/ad/transport/ProfileTransportAction.java	70.83% <0.00%> (-11.52%)	6.00% <0.00%> (ø%)
... and 105 more