Import dayjs ESM module variants

[netmikey]

In order to get rid of warnings like:

Warning: /node_modules/material-dayjs-adapter/fesm2020/tabuckner-material-dayjs-adapter.mjs depends on 'dayjs'. CommonJS or AMD dependencies can cause optimization bailouts.
For more info see: https://angular.io/guide/build#configuring-commonjs-dependencies

Replace all imports like

import dayjs from 'dayjs';
import duration from 'dayjs/plugin/duration';

with the ESM module variants:

import dayjs from 'dayjs/esm';
import duration from 'dayjs/esm/plugin/duration';