dev: go first step to make typst-preview as a library

[Myriad-Dreamin]

This PR makes typst-preview as a library, and provides the only API:

pub async fn preview(arguments: PreviewArgs, compiler_driver: CompileDriver) -> Previewer;

Though, the compiler is not decoupled but a fixed implementation: typst_ts_compiler::service::CompileDriver, we can discuss a nice interface in future. For example:

pub trait CompileHost {
    /// Host must provides a document to watch
    fn subscribe_doc(&self) -> Option<tokio::sync::watch::Receiver<Option<Arc<Document>>>>;
    /// Optional: watch compile status
    fn subscribe_status(&self) -> Option<tokio::sync::watch::Receiver<CompileStatus>> {
        None
    }

    // todo: sync or async
    /// fixme: character is 0-based, UTF-16 code unit. We treat it as UTF-8 now.
    /// Optional: resolve jump
    fn resolve_src_to_doc_jump(
        &mut self,
        _filepath: PathBuf,
        _line: usize,
        _character: usize,
    ) -> ZResult<Option<Position>> {
        Ok(None)
    }

    /// Optional: resolve span
    fn resolve_span(&mut self, _span_id: Span) -> ZResult<Option<DocToSrcJumpInfo>> {
        Ok(None)
    }
}

There are two major improvement based on typst-preview in future:

Integrate typst-preview into typst-lsp

Discussion:

• typst-lsp doesn't solve Can't run in /tmp (but can in /tmp/some-dir) #130, which may introduce notify problem.
• typst-lsp doesn't solve Clarify behavior of typst-preview watch #114, but uses an integrated watcher and watch the root directory, means it doesn't response changes that are not from the editor.

Integrate typst-preview into other projects, such as Nólë

Same.

Run typst-preview in web workspace

Our first step is decoupling hyper, which is needless in web extension. see related issue, #172.