update require js and xquery parser with language features

[line-o]

• add missing language features: arrays, lookups, string constructors, lookups and arrow expression
• update require JS to v2.3.6
• add .gitignore
• add package-lock.json

[joewiz]

Wow, great! I bet @wcandillon would like this PR too! Would it be possible to add an exemplar files showing arrays, lookups, string constructors, lookups, and arrow expressions being highlighted?

[joewiz]

See also wcandillon#48, which might be worth reviewing?

[joewiz]

See also https://github.com/Quodatum/xqlint/commits/basex - a branch by @Quodatum for basex, and wcandillon#57 (comment) for additional context.

[joewiz]

@line-o Please consider migrating your PR to https://github.com/eXist-db/xqlint, where we might be able to wrangle some additional reviewers, since it's administered by the https://github.com/orgs/eXist-db/teams/tools team.