build: add dependabot

[shizhMSFT]

What this PR does / why we need it

Add dependabot

Which issue(s) this PR resolves / fixes

Resolves #60

Please check the following list

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@6debbd6). Click here to learn what that means.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage        ?   73.07%           
=======================================
  Files           ?       31           
  Lines           ?     1040           
  Branches        ?       91           
=======================================
  Hits            ?      760           
  Misses          ?      228           
  Partials        ?       52           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Wwwsylvia]

LGTM