feat(notifications): Add factory method for Notification DTO

[FelixTing]

Signed-off-by: Felix Ting felix@iotechsys.com

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/go-mod-core-contracts/blob/master/.github/Contributing.md.

What is the current behavior?

Issue Number: #530

What is the new behavior?

Added factory method for Notification DTO.

Close #530

Does this PR introduce a breaking change?

• Yes
• No

New Imports

• Yes
• No

[codecov-io]

Codecov Report

Merging #531 (5dcc54c) into master (860d36c) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   56.49%   56.63%   +0.13%     
==========================================
  Files         119      119              
  Lines        3556     3567      +11     
==========================================
+ Hits         2009     2020      +11     
  Misses       1357     1357              
  Partials      190      190              

Impacted Files	Coverage Δ
v2/dtos/notification.go	25.58% <100.00%> (+25.58%)	⬆️

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[lenny-goodell]

LGTM