Add Series RTL and SeriesView

Introduces a new RTL module for handling series data, enabling efficient
storage and retrieval of time-series data in a Struct-of-Arrays (SoA)
format.

Includes `SeriesView`, a zero-copy wrapper that provides a fast,
read-only interface to individual columns within a `RecordSeries`,
optimizing performance for data access in the VM.

Registers new native functions `create-series` and `push-series` for
managing series data.

src/ast/rtl/mod.rs

@@ -11,4 +11,5 @@ pub fn register(env: &Environment) {
     core::register(env);
     datetime::register(env);
     math::register(env);
+    series::register(env);
 }