allow compiling different sections to Object

[roopakv]

Is your feature request related to a problem? Please describe.
A common example of how we use this library is replacing a block on an existing message. To do this, i have to construct a whole new message rather than construct the block alone. The case this happens is when we send a large message with a button, when we respond we want to replace the actions section alone. But to do that I don't want to construct a message

Describe the solution you'd like
Currently

const blocksToAppend = Message().blocks(Blocks.Section().text('The button was clicked')).buildToObject().blocks?.[0]

Proposed

const blocksToAppend = Blocks.Section().text('The button was clicked').buildToObject()

Describe alternatives you've considered
Use the message method mentioned above

Additional context
Add any other context or screenshots about the feature request here.