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>

beacon_node/beacon_chain/src/beacon_snapshot.rs

@@ -1,4 +1,4 @@
-use serde_derive::Serialize;
+use serde::Serialize;
 use std::sync::Arc;
 use types::{
     beacon_state::CloneConfig, AbstractExecPayload, BeaconState, EthSpec, FullPayload, Hash256,

beacon_node/beacon_chain/src/chain_config.rs

@@ -1,5 +1,5 @@
 pub use proto_array::{DisallowedReOrgOffsets, ReOrgThreshold};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use std::time::Duration;
 use types::{Checkpoint, Epoch, ProgressiveBalancesMode};