UI to show version number

I found the version API is missing but UI wants to consume the version API. Add the version API to return the connector version.

assigned to @crajbanshi

created branch 2-ui-to-show-version-number to address this issue

created branch 2-ui-to-show-version-number-2 to address this issue

mentioned in merge request !3 (closed)

created branch ui-to-show-version-number to address this issue

mentioned in merge request !4 (merged)

mentioned in commit d4b90548

closed with merge request !4 (merged)