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/bound_nodes.rs

@@ -138,6 +138,7 @@ pub enum BoundKind<T = ()> {
     Pipe {
         inputs: Vec<BoundNode<T>>,
         lambda: Box<BoundNode<T>>,
+        out_type: crate::ast::types::StaticType,
     },
     Block {
         exprs: Vec<BoundNode<T>>,