remove unused scan driver options (#2342)

`FileType::Options` are propagated in creating a scan driver, future
options could be added there

Author: onursatici

vortex-file/src/generic.rs

@@ -71,8 +71,6 @@ pub struct GenericScanDriver<R> {
 }
 
 impl<R: VortexReadAt> ScanDriver for GenericScanDriver<R> {
-    type Options = GenericScanOptions;
-
     fn segment_reader(&self) -> Arc<dyn AsyncSegmentReader> {
         self.segment_channel.reader()
     }

vortex-file/src/memory.rs

@@ -39,8 +39,6 @@ impl FileType for InMemoryVortexFile {
 }
 
 impl ScanDriver for InMemoryVortexFile {
-    type Options = ();
-
     fn segment_reader(&self) -> Arc<dyn AsyncSegmentReader> {
         Arc::new(self.clone())
     }

vortex-layout/src/scan/mod.rs

@@ -27,8 +27,6 @@ use crate::segments::{AsyncSegmentReader, SegmentId};
 use crate::{ExprEvaluator, Layout, LayoutReader, LayoutReaderExt, RowMask};
 
 pub trait ScanDriver: 'static + Sized {
-    type Options: Default;
-
     fn segment_reader(&self) -> Arc<dyn AsyncSegmentReader>;
 
     /// Return a future that drives the I/O stream for the segment reader.
@@ -46,7 +44,6 @@ pub trait ScanDriver: 'static + Sized {
 /// A struct for building a scan operation.
 pub struct ScanBuilder<D: ScanDriver> {
     driver: D,
-    driver_options: Option<D::Options>,
     task_executor: Option<Arc<dyn TaskExecutor>>,
     layout: Layout,
     ctx: ContextRef, // TODO(ngates): store this on larger context on Layout
@@ -63,7 +60,6 @@ impl<D: ScanDriver> ScanBuilder<D> {
     pub fn new(driver: D, layout: Layout, ctx: ContextRef) -> Self {
         Self {
             driver,
-            driver_options: None,
             task_executor: None,
             layout,
             ctx,
@@ -123,11 +119,6 @@ impl<D: ScanDriver> ScanBuilder<D> {
         self
     }
 
-    pub fn with_options(mut self, options: D::Options) -> Self {
-        self.driver_options = Some(options);
-        self
-    }
-
     pub fn build(self) -> VortexResult<Scan<D>> {
         let projection = simplify_typed(self.projection, self.layout.dtype())?;
         let filter = self