feat: add support for highlight.js 11

[Sekhmet]

The only change needed to make it work was to replace lexemes with new keywords.$pattern.

Tests are passing, and I was able to use it with some example Solidity codes with highlight.js@11.11.1

Note: package-lock.json was updated using modern version of npm. I could downgrade it if needed.

AccessControl.sol being rendered via Highlight.js 11

See image

Old lexemes behavior in Highlight.js

See image (Highlight.js 10)
See image (Highlight.js 11)

Code (GitHub doesn't properly lex identifiers with $):

pragma experimental SMTChecker$v1;

using StringUtils$LEX for string;

abstract contract AccessControl$LEX is IAccessControl$LEX { }

import "util.sol" as util$asdf;

function id$tx {}

function _checkRole(bytes32 role$11, address account) internal view virtual {
  block.number
}

struct Shipment$LEX {}

enum Status$LEX {
    None$LEX,
}

assembly {
  code.hey := mload(0x40)
}