Hover in `ASSOCIATE` blocks with array slices

[gnikit]

Describe the bug

hover over ARRAY shows the wrong dimension

PROGRAM test_associate_block
    IMPLICIT NONE
    REAL :: A(5), B(5,5), C, III = 1
    ASSOCIATE (ARRAY => B(:,1))
        ARRAY (3) = ARRAY (1) + ARRAY (2)
    END ASSOCIATE
END PROGRAM test_associate_block

I think we can get away with creating a function to parse the dimensions of arrays (see parse_fortan.py near the fortran_var AST node add.), then copy the keywords from the link_obj but impose our own keyword_info i.e. the slice.