Cannot access HugSQL snippets by name

I was expecting I would be able to use HugSQL snippets via `query-fn`. But it seems I can't. I have the following:

```
-- :snip select-snip
select :i*:cols

-- :snip from-snip
from :i*:tables

-- :name snip-query
-- :result many
:snip:select
:snip:from
```

And I tried something like this:

```
;; slect-snip and from-snip are not detected.
(def query-fn (:db.sql/query-fn state/system))
(query-fn
:snip-query
{:select (select-snip {:cols ["id","first"]})
:from (from-snip {:tables ["contact"]})})
```
And I got the following error:

```
Execution error (IllegalArgumentException) at conman.core/find-fn (core.clj:115).
no snippet found for the key: :select-snip', available queries:
```
(Note: if I load the query file like by running `(hugsql/def-db-fns "sql/queries.sql")`, the above works because snippets becomes available in the namespace.)

It seems, with `query-fn`, only the normal query functions are available, but not the snippets. For constructing SQL dynamically, should I consider other alternatives such as HoneySQL?

Start at conman.core/find-fn in core.clj:115 and compare the query-fn path with loading the SQL file through hugsql/def-db-fns, using the provided :snip-query example as the reproduction. Trace how named snippets are registered and define done as either resolving select-snip and from-snip through query-fn or documenting the supported limitation.

Written by the indexing model from the issue text.