[Compound] Implement components (Button) (#1021)

* Create `CompoundButton`

* Some fixes

* Lint fixes

* Start replacing existing `Button` usages

* Replace button usages

* Remove previous Button composable

* Rename `CompoundButton` to `Button`

* Fix emphasized button being displayed as Text

* Fix cancel button in `WaitListView`

* Update screenshots

* Add shorthand functions for `OutlinedButton` and `TextButton`

* Add changelog

* Fix wrong size used for emphasized button in dialog

* Create a private `ButtonInternal` implementation with the shared logic.

- Make `ButtonStyle` private.
- Rename `title` to `text`.
- Rename `buttonStyle` and `buttonSize` to just `style` and `size`.

* Fix several warnings and lint issues.

* Update screenshots

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

features/ftue/impl/src/main/kotlin/io/element/android/features/ftue/impl/welcome/WelcomeView.kt

@@ -97,9 +97,11 @@ fun WelcomeView(
             }
         },
         footer = {
-            Button(modifier = Modifier.fillMaxWidth(), onClick = onContinueClicked) {
-                Text(text = stringResource(CommonStrings.action_continue))
-            }
+            Button(
+                text = stringResource(CommonStrings.action_continue),
+                modifier = Modifier.fillMaxWidth(),
+                onClick = onContinueClicked
+            )
             Spacer(modifier = Modifier.height(32.dp))
         }
     )