Add RTL layout support for reply markups #882

Is your feature request related to a problem? Please describe.

Bots that serve right-to-left languages currently have no Bot API-level way to indicate that a bot or an individual message should use RTL layout. As a result, bots and third-party libraries must implement message-specific workarounds for keyboard ordering and input layout.

Describe the solution you'd like

Please consider adding an optional RTL setting that can be configured either globally for a bot or overridden for an individual message. When enabled:

• Buttons in every row of both Keyboard and InlineKeyboard should be laid out from right to left by reversing the row order.
• The ForceReply input field, including input_field_placeholder, should use RTL direction/alignment.

This would provide a consistent, first-class solution for bots serving Persian, Arabic, Hebrew, Urdu, and other RTL languages without requiring each bot or framework to transform reply markups independently.