SQL expressions in dimension definitions are not auto-wrapped in parentheses

From [Slack](https://cube-js.slack.com/archives/C04NYBJP7RQ/p1679951275112219):

Given the following sample schema:
```yml
cube:
- name: items
sql: SELECT * FROM items
dimensions:
- name: id
sql: id
type: number
primaryKey: true
- name: b
sql: b
type: boolean
- name: c
sql: c
type: boolean
- name: d
sql: d
type: boolean
- name: a
sql: "{CUBE.b} AND {CUBE.c} AND NOT {cube.d}"
type: boolean
```
When I run the following query:
```sql
SELECT
id,
a
FROM
items
WHERE
a IS NULL
```
I expect output that looks something like the following(records where A is null):
```
id | a
---|---
1 |
2 |
3 |
4 |
5 |
```
However what I get is closer to the following:
```
id | a
---|-----
1 | TRUE
2 | TRUE
3 | TRUE
4 | FALSE
5 | TRUE
```
Why this arises becomes more clear after looking at the generated SQL:
```sql
SELECT
id,
b AND c AND NOT d
FROM
items
WHERE
b AND c AND NOT d IS NULL
```
This comes as a in the SQL is replaced with b AND c AND NOT d which creates b AND c AND NOT d IS NULL which is not what I intended.
Having come from Looker what I expected/intended as for something like the following.
```sql
SELECT
id,
(b AND c AND NOT d)
FROM
items
WHERE
(b AND c AND NOT d) IS NULL
```

---

@paveltiunov thinks that "ideally Cube should handle this."