Enable chaining for some patterns

[quasilyte]

Expression: a.b.c
Pattern: (. (. a b) c)
With chaining: (. a b c)

Expression: [a][b]int
Pattern: (array_type a (array_type b int))
With chaining: (array_type a b int)

[quasilyte]

Implemented chaining for . pattern.

[quasilyte]

Implemented chaining for array pattern:

(array [x][y][] z)
=
(array [x] (array [y] (array [] z)))