Implement VC API (#1657)

## Issue Addressed

NA

## Proposed Changes

- Implements a HTTP API for the validator client.
- Creates EIP-2335 keystores with an empty `description` field, instead of a missing `description` field. Adds option to set name.
- Be more graceful with setups without any validators (yet)
    - Remove an error log when there are no validators.
    - Create the `validator` dir if it doesn't exist.
- Allow building a `ValidatorDir` without a withdrawal keystore (required for the API method where we only post a voting keystore).
- Add optional `description` field to `validator_definitions.yml`

## TODO

- [x] Signature header, as per https://github.com/sigp/lighthouse/issues/1269#issuecomment-649879855
- [x] Return validator descriptions
- [x] Return deposit data
- [x] Respect the mnemonic offset
- [x] Check that mnemonic can derive returned keys
- [x] Be strict about non-localhost
- [x] Allow graceful start without any validators (+ create validator dir)
- [x] Docs final pass
- [x] Swap to EIP-2335 description field. 
- [x] Fix Zerioze TODO in VC api types.
- [x] Zeroize secp256k1 key

## Endpoints

- [x] `GET /lighthouse/version`
- [x] `GET /lighthouse/health`
- [x] `GET /lighthouse/validators` 
- [x] `POST /lighthouse/validators/hd`
- [x] `POST /lighthouse/validators/keystore`
- [x] `PATCH /lighthouse/validators/:validator_pubkey`
- [ ] ~~`POST /lighthouse/validators/:validator_pubkey/exit/:epoch`~~ Future works


## Additional Info

TBC

lighthouse/environment/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
 [dependencies]
-tokio = { version = "0.2.21", features = ["macros"] }
+tokio = { version = "0.2.21", features = ["full"] }
 slog = { version = "2.5.2", features = ["max_level_trace"] }
 sloggers = "1.0.0"
 types = { "path" = "../../consensus/types" }

lighthouse/src/main.rs

@@ -283,7 +283,7 @@ fn run<E: EthSpec>(
             let context = environment.core_context();
             let log = context.log().clone();
             let executor = context.executor.clone();
-            let config = validator_client::Config::from_cli(&matches)
+            let config = validator_client::Config::from_cli(&matches, context.log())
                 .map_err(|e| format!("Unable to initialize validator config: {}", e))?;
             environment.runtime().spawn(async move {
                 let run = async {

lighthouse/tests/account_manager.rs

@@ -481,6 +481,7 @@ fn validator_import_launchpad() {
 
     let expected_def = ValidatorDefinition {
         enabled: true,
+        description: "".into(),
         voting_public_key: keystore.public_key().unwrap(),
         signing_definition: SigningDefinition::LocalKeystore {
             voting_keystore_path,