Write data into a topic

User should be able to write data into a topic from ui.

Scenarios:
1. write into the specific partition or not
2. repeat one of messages from topics view (with changing or not) - for text
3. changing for binary - next step

Questions:
1. Variants of button layout:
 - from navigation panel - context menu for the topic
 - Partitions tab - button on specific partition
 - View data tab only 