feat(core): add typeof filter

[JSYOU]

Description

This pull request introduces a new filter called typeof that allows retrieving the type of a variable in templates.
For example, you can now use
{% if context.params.foo|typeof == 'string' %}
to conditionally execute code based on the type of the foo variable.

Issue ticket number

n/a

Additional Context

[vercel]

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Name	Status	Preview	Updated (UTC)
vulcan-sql-document	✅ Ready (Inspect)	Visit Preview	Oct 16, 2023 4:21pm

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
...ate-engine/built-in-extensions/sql-helper/index.ts	100.00% <100.00%> (ø)
...ne/built-in-extensions/sql-helper/typeofBuilder.ts	100.00% <100.00%> (ø)
...ine/built-in-extensions/sql-helper/typeofRunner.ts	75.00% <75.00%> (ø)

... and 1 file with indirect coverage changes

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[kokokuo]

LGTM 👍

[kokokuo]

Remember to add the document to VulcanSQL official document in the future, cc @wwwy3y3, @onlyjackfrost, @cyyeh to know Star add the new filter for checking type.