Limit the impact of using the keyword: DELETED

Just like in#2203 we want to limit the impact of having keywords. Preferably by making them keywords only in the context needed so the string/word can be used for things like table names and column names i the data - if possible. It might be too much of a hassle to make the impact less, but lets investigate what is possible - still sticking to the SQL-99 specs.

Start by making a test file namedtest0000.js where 0000 is the issue ID of this ticket. Replicate the use and mimic what usecases could make sense to test, like as a table name, as a column name, as a graph search. Things lke that.

The grammar can be updated in alasqlgrammar.jison. Focus on small precise changes. After updating it we need to runyarn jison && yarn test

Always runyarn format before committing.