fix: Enable missing features in polars-time

[filabrazilska]

Without having smartstring/serde compiling with --all-features fails because of the smartstring values not being serializable:

$ cargo build --all-features  -p polars-time
   Compiling polars-time v0.38.3 (/home/fila/workspace/polars/crates/polars-time)
error[E0277]: the trait bound `SmartString<LazyCompact>: rolling_window::_::_serde::Serialize` is not satisfied
    --> crates/polars-time/src/group_by/dynamic.rs:21:38
     |
21   |   #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
     |                                        ^^^^^^^^^ the trait `rolling_window::_::_serde::Serialize` is not implemented for `SmartString<LazyCompact>`
22   |   pub struct DynamicGroupOptions {
23   | /     /// Time or index column.
24   | |     pub index_column: SmartString,
     | |_________________________________- required by a bound introduced by this call
     |
     = help: the following other types implement trait `rolling_window::_::_serde::Serialize`:
               bool
               char
               isize
               i8
               i16
               i32
               i64
               i128
             and 134 others
note: required by a bound in `rolling_window::_::_serde::ser::SerializeStruct::serialize_field`
    --> /home/fila/.cargo/registry/src/index.crates.io-6f17d22bba15001f/serde-1.0.197/src/ser/mod.rs:1865:12
     |
1859 |     fn serialize_field<T: ?Sized>(
     |        --------------- required by a bound in this associated function
...
1865 |         T: Serialize;
     |            ^^^^^^^^^ required by this bound in `SerializeStruct::serialize_field`
     = note: this error originates in the derive macro `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info)

The abs feature on the polars-ops crate is necessary for the tests in polars-time to pass.

[codspeed-hq]

CodSpeed Performance Report

Merging #15558 will not alter performance

_{Comparing filabrazilska:smartstring_serde (b4b5423) with main (42d3697)}

Summary

✅ 22 untouched benchmarks

[ritchie46]

Seems good. Thanks!