fix(sqlite): support Tcl-style $param(...) syntax

[SAY-5]

Closes #943.

SQLite's $-prefixed parameter follows Tcl variable syntax, which allows one or more ::-separated suffixes and an optional (...) trailer. Previously the formatter only accepted a bare identifier after $, so inputs like $p(x=y) were tokenized as $p followed by a parenthesized expression and re-emitted with an unwanted space.

This moves SQLite's $-parameter into a dialect-specific custom rule that matches the full Tcl syntax, while : and @ continue to use the default named-parameter path.

Before

> format('select $p(x=y);', { language: 'sqlite' });
'select\n  $p (x = y);'

After

> format('select $p(x=y);', { language: 'sqlite' });
'select\n  $p(x=y);'

Tests cover the existing $name behaviour as well as $p(x=y) and $foo::bar(extra).

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