feat: Specialize pipeline types for performance

Introduces type specialization for reactive pipeline nodes and their
data buffers. This eliminates the overhead of generic `Value` enums and
`SharedValueSeries` when dealing with known scalar or record types.

The architecture shifts buffer instantiation from the VM to the runtime
(RTL), leveraging type information from the AST. A new `out_type` field
is added to `BoundKind::Pipe` to store the static type of the pipeline's
output, determined by the type checker.

This enables the creation of specialized `RingBuffer<T>` and
`SharedRecordSeries` (for Struct-of-Arrays layout) when the output type
is known, significantly improving memory usage and processing speed for
time-series data, especially in financial analysis.

src/ast/compiler/optimizer/utils.rs

@@ -152,7 +152,7 @@ impl UsageInfo {
             BoundKind::Again { args } => {
                 self.collect(args);
             }
-            BoundKind::Pipe { inputs, lambda } => {
+            BoundKind::Pipe { inputs, lambda, .. } => {
                 for input in inputs {
                     self.collect(input);
                 }