Improve vesting discovery and error messages

When loading a ETH address as vesting contract we show a cryptic error
message, which non tech-savy end users don't understand, this commit
changes it to something more human readable.

We allow users to enter and load a contract that probably isn't a
vesting contract.

The `getInfo` function in the `vesting` folder is very prone to possible
errors, and benefits from some parallelization between all the method
calls.

We allow hereby to enter a contract address in search and once on the
contract profile page we provide a link to the detailed vesting
information if available.

Signed-off-by: Sebastian Martinez <me@sebastinez.dev>

src/components/TextInput.svelte

@@ -31,7 +31,7 @@
   });
 
   function handleKeydown(event: KeyboardEvent) {
-    if (event.key === "Enter") {
+    if (event.key === "Enter" && valid) {
       dispatch("submit");
     }
   }