Support .astro file loading on graphql-tag-pluck

[XiNiHa]

Is your feature request related to a problem? Please describe.

Currently, graphql-tag-pluck (and packages depending on it) doesn't support loading documents from .astro files.

Describe the solution you'd like

Add .astro support on graphql-tag-pluck

Describe alternatives you've considered

Let Astro users define documents in .ts files and import them, which is inconvenient.

Additional context

[XiNiHa]

The problem I found while implementing the fix is that the @astrojs/compiler doesn't provide any synchronous interfaces to transform the file (since it runs with WASM.) Is it okay to implement the feature async only?

Just found that the Astro compiler provides a synchronous version.