Support float literals: Nan, Inf, Infinity

[nafraf]

This PR is to support float literals (Nan, Inf, Infinity), this is part of the solution to redisgraph issue Support isNaN function and Inf, Infinity, and NaN literals.

cypher-lint sample output:

$ echo 'RETURN NaN' | ./cypher-lint -a -1
@0  0..11  statement           body=@1
@1  0..11  > query             clauses=[@2]
@2  0..11  > > RETURN          projections=[@3]
@3  7..11  > > > projection    expression=@4, alias=@5
@4  7..10  > > > > NAN
@5  7..11  > > > > identifier  `NaN`

$ echo 'RETURN Inf' | ./cypher-lint -a -1
@0  0..11  statement           body=@1
@1  0..11  > query             clauses=[@2]
@2  0..11  > > RETURN          projections=[@3]
@3  7..11  > > > projection    expression=@4, alias=@5
@4  7..10  > > > > INF
@5  7..11  > > > > identifier  `Inf`

$ echo 'RETURN INFINITY' | ./cypher-lint -a -1
@0  0..16  statement           body=@1
@1  0..16  > query             clauses=[@2]
@2  0..16  > > RETURN          projections=[@3]
@3  7..16  > > > projection    expression=@4, alias=@5
@4  7..15  > > > > INF
@5  7..16  > > > > identifier  `INFINITY`