feat: implement required components

[simbleau]

Closes #100

[RobertBrewitz]

Should the examples be updated as well to use required components instead of their bundle counterparts?

[simbleau]

Should the examples be updated as well to use required components instead of their bundle counterparts?

I did that

[RobertBrewitz]

Should the examples be updated as well to use required components instead of their bundle counterparts?

I did that

To clarify, these examples and lines are still spawning Bundles, if this is intended, I am good with the PR.

examples/text/src/main.rs
35:    commands.spawn(VelloTextBundle {
53:    commands.spawn(VelloTextBundle {

examples/drag_n_drop/src/main.rs
31:    commands.spawn(VelloSvgBundle {
119:            commands.spawn(VelloSvgBundle {
133:            commands.spawn(VelloLottieBundle {
159:            commands.spawn(VelloSvgBundle {
165:            commands.spawn(VelloLottieBundle {

examples/scene_ui/src/main.rs
33:        VelloSceneBundle {

examples/demo/src/main.rs
30:        .spawn(VelloLottieBundle {

[simbleau]

Most of those were intended, however some I did cleanup. :) We're good now