function aceVimMap(lhs, rhs, ctx) {
    dispatchSKEvent("front", ['addVimMap', lhs, rhs, ctx]);
}
Map the key sequence `lhs` to `rhs` for mode `ctx` in ACE editor.

@param {string} lhs a key sequence to replace
@param {string} rhs a key sequence to be replaced
@param {string} ctx a mode such as `insert`, `normal`.

@example aceVimMap('J', ':bn', 'normal');