[EPIC] DAS improvement tracking issue

[renaynay]

This issue tracks all DAS-related feature/improvement issues.

TODO

• [x] https://github.com/celestiaorg/celestia-node/issues/427
• [ ] https://github.com/celestiaorg/celestia-node/issues/554
• [x] https://github.com/celestiaorg/celestia-node/issues/180
• [x] https://github.com/celestiaorg/celestia-node/issues/601
• [ ] https://github.com/celestiaorg/celestia-node/issues/504 --> depends on implementation of 180 + some sort of manual and/or automatic implementation of retry functionality
• [x] https://github.com/celestiaorg/celestia-node/issues/483

Testing

• [ ] https://github.com/celestiaorg/celestia-node/issues/422

Still deciding whether necessary

• [x] https://github.com/celestiaorg/celestia-node/issues/335