tree: allow string concat with any non-array type (anynonarray approach)

[otan]

Refs #41872. This method solves the problem with heavy edits to the
type system.

Previously, the || concat operator only worked on string pairs. Postgres
supports concatenation between strings and any other non-array type. This
patch adds support for that as well.

To support this, we add another heuristic to the overload detection to
prefer omitting "Any" if possible. Furthermore, we add a new
AnyNonArray type constant to types.go to encode not being able to
append to arrays.

Release note (sql change): the concatenation operator || is now usable
between strings and any other non-array type.

[cockroach-teamcity]

This change is 

[otan]

The remaining test failure b'hello' || 'world' differs between sql/concat and opt/no-opt -- seemingly due to constant folding for the sql case. This is because of the String + Any // vice versa being introduced. Any ideas @jordanlewis before I do a deeper dive? So close haha, but could be a fundamental problem with how we deal with types :)

--- FAIL: TestEval (0.53s)
    --- FAIL: TestEval/opt (0.04s)
        --- FAIL: TestEval/opt/concat (0.00s)
            datadriven.go:154:
                testdata/eval/concat:18: b'hello' || 'world'
                expected:
                '\x68656c6c6f776f726c64'

                found:
                e'\'\\x68656c6c6f\'world'
    --- FAIL: TestEval/no-opt (0.04s)
        --- FAIL: TestEval/no-opt/concat (0.00s)
            datadriven.go:154:
                testdata/eval/concat:18: b'hello' || 'world'
                expected:
                '\x68656c6c6f776f726c64'

                found:
                e'\'\\x68656c6c6f\'world'
    --- FAIL: TestEval/sql (0.35s)
        --- FAIL: TestEval/sql/concat (0.00s)
            datadriven.go:154:
                testdata/eval/concat:18: b'hello' || 'world'
                expected:
                '\x68656c6c6f776f726c64'

                found:
                'helloworld'
    --- FAIL: TestEval/vectorized (0.11s)
        --- FAIL: TestEval/vectorized/concat (0.00s)
            datadriven.go:154:
                testdata/eval/concat:18: b'hello' || 'world'
                expected:
                '\x68656c6c6f776f726c64'

                found:
                'helloworld'

[otan]

looks like optimiser makes some assumptions about types: TestTypingBinaryAssumptions - so we have two ways of evaluating types?!

[otan]

let's try #43190.

[otan]