Duration bug on livestream teaser and change date library to dayjs

[retif]

Related Issue/Ticket:

Live Stream and Virtual Meeting duration were displayed not precise enough using moment.humanize method(for example 45 minutes it is displayed as one hour).
While fixing this problem I am also replaced momentjs with dayjs which has almost the same API, but in 2kb package, so this PR also solves the problem of unreasonable bundle size used by moments library.

Steps to test:

• Check dates and duration displayed on live stream, virtual meeting and video teaser
• Check dates and duration displayed on live stream, virtual meeting and video page

created based on #275

Quality checks:

Please check these boxes to confirm this PR covers the following cases:

• Maintaining our upgrade path is essential. Check one or the other:
  • This PR provides updates via hook_update_N or other means.
  • No updates are necessary for this change.
• Front end fixes should be tested against all of the Open Y Themes.
  • Tested against Carnation
  • Tested against Lily
  • Tested against Rose
  • This change does not contain front-end fixes.
• I have flagged this PR "Needs Review" or pinged the VY devs/QA
  team in Slack

[hamrant]

Fix for builds in #278

[fjbot]

Build 2673

Find the builds:
http://pr-277.openy-gated-content.sandbox-2.ci.fivejars.com
http://rose.pr-277.openy-gated-content.sandbox-2.ci.fivejars.com
http://lily.pr-277.openy-gated-content.sandbox-2.ci.fivejars.com
http://carnation.pr-277.openy-gated-content.sandbox-2.ci.fivejars.com
http://upgrade.pr-277.openy-gated-content.sandbox-2.ci.fivejars.com

[AnastasiiaPys]

Tested, all good!