Move markwon to adapter

...g/futo/circles/feature/timeline/TimelineDialogFragment.kt

...org/futo/circles/feature/timeline/list/TimelineAdapter.kt

.../futo/circles/feature/timeline/list/TimelineViewHolder.kt

.../org/futo/circles/core/feature/markdown/MarkdownParser.kt

...les/core/feature/timeline/builder/MultiTimelineBuilder.kt

...es/core/feature/timeline/builder/SingleTimelineBuilder.kt

...re/feature/timeline/data_source/BaseTimelineDataSource.kt

...rcles/core/feature/timeline/post/PostContentDataSource.kt

.../org/futo/circles/core/mapping/MediaPostContentMapping.kt

...a/org/futo/circles/core/mapping/TextPostContentMapping.kt

...ava/org/futo/circles/core/mapping/TimelineEventMapping.kt

.../src/main/java/org/futo/circles/core/model/PostContent.kt