Revert "Adding support for Polars structs" (nushell#11171)

Reverts nushell#10943 The current implementation of `arr_to_value` is unsound, as it allows casts of arbitrary data to arbitrary types without being marked `unsafe`. The full safety requirements to perform both the cast and the following unchecked access are not as clear that a simple change of `fn arr_to_value` to `unsafe fn arr_to_value` could be blessed without further investigation. cc @ayax79
MarikaChlebowska · Nov 29, 2023 · 112306a · 112306a
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/crates/nu-cmd-dataframe/Cargo.toml b/crates/nu-cmd-dataframe/Cargo.toml
@@ -19,7 +19,6 @@ nu-protocol = { path = "../nu-protocol", version = "0.87.2" }
 
 # Potential dependencies for extras
 chrono = { version = "0.4", features = ["std", "unstable-locales"], default-features = false }
-chrono-tz = "0.8"
 fancy-regex = "0.11"
 indexmap = { version = "2.1" }
 num = { version = "0.4", optional = true }