intake/intake-esm: Intake-esm v2020.11.4

Features ✨ Support multiple variable assets/files. ({pr}287) @andersy005 ✨ Add utility function for printing version information. ({pr}284) @andersy005 Breaking Changes Remove unnecessary logging bits. ({pr}297) @andersy005 Bug Fixes ✔️ Fix test failures. ({pr}280) @andersy005 Fix TypeError bug in .search() method when using wildcard and regular expressions. ({pr}285) @andersy005 Use file like object when dealing with netcdf in the cloud. ({pr}292) @andersy005 Fix import errors due to intake/intake#526. ({pr}282) @andersy005 Documentation Fix ReadtheDocs documentation builds. ({pr}286) @andersy005 Migrate docs from restructured text to markdown via myst-parsers. ({pr}296) @andersy005 Refactor documentation contents & add new notebooks. ({pr}298) @andersy005 Internal Changes Migrate CI from CircleCI to GitHub Actions. ({pr}283) @andersy005 Use mamba to speed up CI testing. ({pr}293) @andersy005 Enable dependabot updates. ({pr}294) @andersy005 Test against Python 3.9. ({pr}295) @andersy00