lp1187993: Replace dojo autocomplete with accessible autocomplete

lp1187993: Replace dojo autocomplete with accessible autocomplete

This autocomplete uses vanilla javascript to implement
the Combobox With List Autocomplete pattern from the
Aria Authoring Practices. This commit uses ES modules,
denoted by the .mjs extension.

It makes use of some bootstrap styles.  It should be
compatible with both bootsrap 4 and 5.  It theoretically
works on the non-bootstrap TPAC as well, but will
likely need some design work to be satisfying in that
interface.

Otherwise, this autocomplete JS uses the same APIs as
the previous interface did.

Also included is a small test suite and an eslint
configuration.

Signed-off-by: Jane Sandberg <js7389@princeton.edu>