Add SensitiveUrl to redact user secrets from endpoints (#2326)

## Issue Addressed

#2276 

## Proposed Changes

Add the `SensitiveUrl` struct which wraps `Url` and implements custom `Display` and `Debug` traits to redact user secrets from being logged in eth1 endpoints, beacon node endpoints and metrics.

## Additional Info

This also includes a small rewrite of the eth1 crate to make requests using `Url` instead of `&str`. 
Some error messages have also been changed to remove `Url` data.

Cargo.lock

@@ -25,6 +25,7 @@ dependencies = [
  "rand 0.7.3",
  "rayon",
  "safe_arith",
+ "sensitive_url",
  "slashing_protection",
  "slog",
  "slog-async",
@@ -650,6 +651,7 @@ dependencies = [
  "logging",
  "node_test_rig",
  "rand 0.7.3",
+ "sensitive_url",
  "serde",
  "slasher",
  "slog",
@@ -1896,6 +1898,7 @@ dependencies = [
  "merkle_proof",
  "parking_lot",
  "reqwest",
+ "sensitive_url",
  "serde",
  "serde_json",
  "slog",
@@ -1942,6 +1945,7 @@ dependencies = [
  "psutil",
  "reqwest",
  "ring",
+ "sensitive_url",
  "serde",
  "serde_json",
  "serde_utils",
@@ -2514,6 +2518,7 @@ dependencies = [
  "merkle_proof",
  "parking_lot",
  "rayon",
+ "sensitive_url",
  "serde",
  "serde_derive",
  "slog",
@@ -2844,6 +2849,7 @@ dependencies = [
  "lighthouse_version",
  "network",
  "parking_lot",
+ "sensitive_url",
  "serde",
  "slog",
  "slot_clock",
@@ -3347,6 +3353,7 @@ dependencies = [
  "log",
  "rand 0.7.3",
  "regex",
+ "sensitive_url",
  "serde",
  "serde_yaml",
  "simple_logger",
@@ -4189,6 +4196,7 @@ dependencies = [
  "futures 0.3.14",
  "genesis",
  "reqwest",
+ "sensitive_url",
  "serde",
  "tempfile",
  "types",
@@ -5155,6 +5163,7 @@ dependencies = [
  "rand 0.7.3",
  "remote_signer_test",
  "reqwest",
+ "sensitive_url",
  "serde",
  "tokio 1.5.0",
  "types",
@@ -5171,6 +5180,7 @@ dependencies = [
  "remote_signer_client",
  "remote_signer_consumer",
  "reqwest",
+ "sensitive_url",
  "serde",
  "serde_json",
  "tempfile",
@@ -5499,6 +5509,14 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
+[[package]]
+name = "sensitive_url"
+version = "0.1.0"
+dependencies = [
+ "serde",
+ "url",
+]
+
 [[package]]
 name = "serde"
 version = "1.0.125"
@@ -5714,6 +5732,7 @@ dependencies = [
  "node_test_rig",
  "parking_lot",
  "rayon",
+ "sensitive_url",
  "tokio 1.5.0",
  "types",
  "validator_client",
@@ -7052,6 +7071,7 @@ dependencies = [
  "ring",
  "safe_arith",
  "scrypt",
+ "sensitive_url",
  "serde",
  "serde_derive",
  "serde_json",