Add support for beaconAPI in lcli functions (#3252)

## Issue Addressed

NA

## Proposed Changes

Modifies `lcli skip-slots` and `lcli transition-blocks` allow them to source blocks/states from a beaconAPI and also gives them some more features to assist with benchmarking.

## Additional Info

Breaks the current `lcli skip-slots` and `lcli transition-blocks` APIs by changing some flag names. It should be simple enough to figure out the changes via `--help`.

Currently blocked on #3263.

common/sensitive_url/src/lib.rs

@@ -1,5 +1,6 @@
 use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 use std::fmt;
+use std::str::FromStr;
 use url::Url;
 
 #[derive(Debug)]
@@ -9,6 +10,12 @@ pub enum SensitiveError {
     RedactError(String),
 }
 
+impl fmt::Display for SensitiveError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}
+
 // Wrapper around Url which provides a custom `Display` implementation to protect user secrets.
 #[derive(Clone, PartialEq)]
 pub struct SensitiveUrl {
@@ -54,6 +61,14 @@ impl<'de> Deserialize<'de> for SensitiveUrl {
     }
 }
 
+impl FromStr for SensitiveUrl {
+    type Err = SensitiveError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Self::parse(s)
+    }
+}
+
 impl SensitiveUrl {
     pub fn parse(url: &str) -> Result<Self, SensitiveError> {
         let surl = Url::parse(url).map_err(SensitiveError::ParseError)?;