cockroachdb / cockroachdb/cockroach

sql: support numeric literals

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A-sql-pgcompat C-bug E-quick-win O-pg-regress P-3 T-sql-queries
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Description

postgres supports the following syntax for numeric literals, which results in a lexical error in crdb:

```
SELECT 0b100101;
-- 37

SELECT 0o273;
-- 187

SELECT .000_005;
-- 0.000005
```

Found in pg_regress numerology.

Jira issue: CRDB-33910

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