Tests for NumericSeparatorLiteral. Closes gh-1051

...ls/numeric/numeric-separator-literal-bil-bd-nsl-bd-err.js

...terals/numeric/numeric-separator-literal-bil-bd-nsl-bd.js

...erals/numeric/numeric-separator-literal-bil-bd-nsl-bds.js

...erals/numeric/numeric-separator-literal-bil-bds-nsl-bd.js

...rals/numeric/numeric-separator-literal-bil-bds-nsl-bds.js

...umeric/numeric-separator-literal-bil-nsl-bd-dunder-err.js

...erals/numeric/numeric-separator-literal-bil-nsl-bd-err.js

...ic-separator-literal-dd-dot-dd-ep-sign-minus-dd-nsl-dd.js

...c-separator-literal-dd-dot-dd-ep-sign-minus-dds-nsl-dd.js

...ric-separator-literal-dd-dot-dd-ep-sign-plus-dd-nsl-dd.js

...ic-separator-literal-dd-dot-dd-ep-sign-plus-dds-nsl-dd.js

...als/numeric/numeric-separator-literal-dd-nsl-dd-one-of.js

...umeric/numeric-separator-literal-dd-nsl-dds-dunder-err.js

.../literals/numeric/numeric-separator-literal-dd-nsl-err.js

...eric/numeric-separator-literal-dds-dot-dd-nsl-dd-ep-dd.js

.../literals/numeric/numeric-separator-literal-dds-nsl-dd.js

...meric/numeric-separator-literal-dds-nsl-dds-dunder-err.js

...literals/numeric/numeric-separator-literal-dds-nsl-err.js

...ic/numeric-separator-literal-dil-dot-dds-nsl-ep-dd-err.js

...s/numeric/numeric-separator-literal-dil-dot-nsl-ep-err.js