feat: add support for es2020
syntax in shared eslint config
#153
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Inspired by this comment thread, this PR adds support for
es2020
syntax. The primary rationale is that given we are to beginning to supportglobalThis
syntax in shared JS libraries and MFEs, we should ensure other related ES2020 syntax is included as well, and implemented in such a way that is common/applicable as opposed to being added to individual ESLint configs. The Open edX platform officially supports the browsers defined in@edx/browserslist-config
(source), where all have support fores2020
syntax.