Introducing SAM support for EventBridgeRule, modeled after the existing CloudWatchEvent...

[nikp]

…, and guiding users to new service

Description of changes:

Add support for explicitly referencing "EventBridge" - the service that superseded "CloudWatch Events

The meaningful part of this CR is actually ONLY 3 lines of code in push.py:

class EventBridgeRule(CloudWatchEvent):
    """EventBridge Rule event source for SAM Functions."""
    resource_type = 'EventBridgeRule'

The rest is examples, doc, and test file updates

There are 2 code samples in serverless-application-model that refer to cloudwatchevents. I kept the directories of the old ones for someone who’s only familiar with “cloudwatch events” to be able to discover them, but copied the code to new eventbridge - named code sample directories. In the original directory i added README referencing the move and linking to the new none

Schedule triggers use Events rules underneath, so no specification requirements have to be made. However a couple places in the code refer to them as “CloudWatchEvents Schedule” - since that’s not backwards incompatible i just renamed those to EventBridge Schedule"

Description of how you validated changes:

make test/make pr

Pure renaming

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #1241 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1241      +/-   ##
===========================================
+ Coverage    94.45%   94.46%   +<.01%     
===========================================
  Files           78       78              
  Lines         4332     4334       +2     
  Branches       854      854              
===========================================
+ Hits          4092     4094       +2     
  Misses         114      114              
  Partials       126      126

Impacted Files	Coverage Δ
samtranslator/model/eventsources/push.py	90.92% <100%> (+0.03%)	⬆️

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[praneetap]

Thanks for this change @nikp!
Please make sure the merge conflicts are resolved.

[keetonian]

Rebased and pushed changes. Thank you for this contribution!