[BIP Draft] Segregated Data: a prunable, script-isolated block region for data carriage

The recent discussions around SegData have highlighted its distinctive approach to data storage options for node operators compared to existing vectors. Unlike traditional systems, SegData provides operators with the flexibility to opt out of storing data. This feature marks a significant shift from the conventional models where such choices are not available. This flexibility could potentially lead to changes in how data storage ecosystems function, offering more control to individual node operators and possibly influencing data management strategies within networks.