fix(parse): split a bare alias at a top-level space

[tiagolauer]

Fixes #276.

The bug

Query<DB, 'select power(age, 2) from users'>            // { '2)': unknown }[]
StrictRow<DB, 'select power(age, 2) from users'>        // QueryTypeError<'unknown column: power(age,'>
Query<DB, 'select cast(id as text) from users'>         // { 'as text)': unknown }[]
Query<DB, 'select extract(epoch from created_at) from users'> // { 'from created_at)': unknown }[]
Query<DB, "select coalesce(name, 'anon') from users">   // { "'')": unknown }[]

Adding an explicit alias made it work, but select power(age, 2) is everyday SQL and should give a power column like other unaliased calls do.

The fix

The bare-alias fallback matched `${infer Expression} ${infer Alias}`, which splits at the first space with no paren-balance check guarding the branch.

The split is now depth-tracked, reusing the ApplyParenDelta the sibling scans (FindTopLevelAsKeyword, ColumnsBeforeFrom) already use. A space inside a call is no longer a boundary, so an entry that is one call from end to end has no alias to find and falls through to OutputName — which is how count(*) has always been named.

Verification

tests/multiarg-call-alias.test-d.ts, eleven cases. Six red on master:

tests/multiarg-call-alias.test-d.ts(20,3): error TS2344: Type 'false' does not satisfy the constraint 'true'.
tests/multiarg-call-alias.test-d.ts(24,3): ...  (28,3), (32,3), (36,3), (41,3)

• power(age, 2) in both modes, cast(id as text), extract(epoch from created_at), coalesce(name, 'anon'), and one among ordinary columns
• an alias after the call is still an alias, bare or with AS

Controls: lower(name), count(*) and a plain bare alias are unchanged.

tsc --noEmit clean, 192 runtime tests pass. Budget 191,482 — 1,004 below master: the naive match was building an alias candidate for entries that went on to discard it.