This PR adds the `ui::Table` component.
It has a rather simple API, but cells can contain either strings or
elements, allowing for some complex uses.
Example usage:
```rust
Table::new(vec!["Product", "Price", "Stock"])
.width(px(600.))
.striped()
.row(vec!["Laptop", "$999", "In Stock"])
.row(vec!["Phone", "$599", "Low Stock"])
.row(vec!["Tablet", "$399", "Out of Stock"])
```
For more complex use cases, the table supports mixed content:
```rust
Table::new(vec!["Status", "Name", "Priority", "Deadline", "Action"])
.width(px(840.))
.row(vec![
element_cell(Indicator::dot().color(Color::Success).into_any_element()),
string_cell("Project A"),
string_cell("High"),
string_cell("2023-12-31"),
element_cell(Button::new("view_a", "View").style(ButtonStyle::Filled).full_width().into_any_element()),
])
// ... more rows
```
Preview:

This component is pretty basic, improvements are welcome!
Release Notes:
- N/A