cli branch create/set: add --to aliases for -r

Now that `jj move` does not accept `-r` (since it has `--from` and `--to`), `jj set --to` seems more useful
than `jj set -r`. `create --to` is also added for ease of switching
between `branch create` and `branch move`.

cli/src/commands/branch/create.rs

@@ -25,7 +25,10 @@ use crate::ui::Ui;
 #[derive(clap::Args, Clone, Debug)]
 pub struct BranchCreateArgs {
     /// The branch's target revision
-    #[arg(long, short)]
+    //
+    // The `--to` alias exists for making it easier for the user to switch
+    // between `branch create`, `branch move`, and `branch set`.
+    #[arg(long, short, visible_alias = "to")]
     revision: Option<RevisionArg>,
 
     /// The branches to create

cli/src/commands/branch/set.rs

@@ -25,7 +25,7 @@ use crate::ui::Ui;
 #[derive(clap::Args, Clone, Debug)]
 pub struct BranchSetArgs {
     /// The branch's target revision
-    #[arg(long, short)]
+    #[arg(long, short, visible_alias = "to")]
     revision: Option<RevisionArg>,
 
     /// Allow moving the branch backwards or sideways