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feat: expose the renderer interface (#1094)

This adds the ability to use a custom renderer using a modified version
of the existing `renderer` interface. This also keeps track of enabled
capabilities and ensure they are turned off on program exit. It only
turns off enabled capabilities rather.

The new API looks like:

```go
// Renderer is the interface for Bubble Tea renderers.
type Renderer interface {
	// Close closes the renderer and flushes any remaining data.
	Close() error

	// Render renders a frame to the output.
	Render(string) error

	// SetOutput sets the output for the renderer.
	SetOutput(io.Writer)

	// Flush flushes the renderer's buffer to the output.
	Flush() error

	// InsertAbove inserts lines above the current frame. This only works in
	// inline mode.
	InsertAbove(string) error

	// Resize sets the size of the terminal.
	Resize(w int, h int)

	// Request a full re-render. Note that this will not trigger a render
	// immediately. Rather, this method causes the next render to be a full
	// Repaint. Because of this, it's safe to call this method multiple times
	// in succession.
	Repaint()

	// ClearScreen clear the terminal screen. This should always have the same
	// behavior as the "clear" command which is equivalent to `CSI 2 J` and
	// `CSI H`.
	ClearScreen()

	// SetMode sets a terminal mode on/off. The mode argument is an int
	// consisting of the mode identifier.
	// For example, to set alt-screen mode, you would call SetMode(1049, true).
	SetMode(mode int, on bool)

	// Mode returns whether the render has a mode enabled.
	// For example, to check if alt-screen mode is enabled, you would call
	// Mode(1049).
	Mode(mode int) bool
}
```

--- 

This also introduces some performance gains by not writing unnecessary
sequences on enable/disable terminal modes. For example, we always hide
the cursor when the program runs, it doesn't make sense to write the
sequence again whe... (continued)

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