Move dependencies to workspace (#4650)

## Issue Addressed

Synchronize dependencies and edition on the workspace `Cargo.toml`

## Proposed Changes

with https://github.com/rust-lang/cargo/issues/8415 merged it's now possible to synchronize details on the workspace `Cargo.toml` like the metadata and dependencies.
By only having dependencies that are shared between multiple crates aligned on the workspace `Cargo.toml` it's easier to not miss duplicate versions of the same dependency and therefore ease on the compile times.

## Additional Info
this PR also removes the no longer required direct dependency of the `serde_derive` crate.

should be reviewed after https://github.com/sigp/lighthouse/pull/4639 get's merged.
closes https://github.com/sigp/lighthouse/issues/4651


Co-authored-by: Michael Sproul <michael@sigmaprime.io>
Co-authored-by: Michael Sproul <micsproul@gmail.com>

consensus/state_processing/src/metrics.rs

@@ -1,5 +1,3 @@
-#![cfg(feature = "metrics")]
-
 use lazy_static::lazy_static;
 pub use lighthouse_metrics::*;
 

consensus/state_processing/src/per_epoch_processing/epoch_processing_summary.rs

@@ -21,7 +21,6 @@ pub enum EpochProcessingSummary<T: EthSpec> {
 
 impl<T: EthSpec> EpochProcessingSummary<T> {
     /// Updates some Prometheus metrics with some values in `self`.
-    #[cfg(feature = "metrics")]
     pub fn observe_metrics(&self) -> Result<(), ParticipationCacheError> {
         metrics::set_gauge(
             &metrics::PARTICIPATION_PREV_EPOCH_HEAD_ATTESTING_GWEI_TOTAL,