chore: implement basic logic to show a text field in the MultiEntry component

This logic does not support any info types other than a String, represented by an OutlinedTextField. To support more, this will likely need to completely overhaul every input component so that they accept the ValueType as a primary argument.

src/common/form_schema.rs

@@ -0,0 +1,18 @@
+use serde::{Serialize, Deserialize};
+
+/// Defines a series of options that allow a user to define a form.
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub enum InputType{
+    /// Represents a text input. Requires a `String` key. The entered value will be returned as a
+    /// single `String` value.
+    Text,
+    /// Represents a number input. Requires a `String` key. The entered value will be returned as a
+    /// single `i32` value.
+    Number,
+    /// Represents a radio input. Requires a `String` key and a series of options. The selected
+    /// value will be returned as a single `String` value.
+    Radio(Vec<String>),
+    /// Represents a checkbox input. Requires a `String` key and a series of options. The selected
+    /// value will be returned as a `Vec<String>`.
+    Checkbox(Vec<String>)
+}