chore: added generic conversion method

[Neocryptoquant]

Changes made:
#[cfg(feature = "internal-test")]
pub fn get_feature_set(&self) -> Arc<FeatureSet> {
self.feature_set.clone(). into()

Command cargo bench --features internal-test ran with error, until I added the bolded

error[E0308]: mismatched types
--> crates/litesvm/src/lib.rs:1306:9
|
1305 | pub fn get_feature_set(&self) -> Arc {
| --------------- expected Arc<FeatureSet> because of return type
1306 | self.feature_set.clone()
| ^^^^^^^^^^^^^^^^^^^^^^^^ expected Arc<FeatureSet>, found FeatureSet
|
= note: expected struct Arc<FeatureSet>
found struct FeatureSet
help: call Into::into on this expression to convert FeatureSet into Arc<FeatureSet>
|
1306 | self.feature_set.clone().into()
| +++++++