Update to CometBFT v1

[Rigorously]

After the storage fix, RocksDB growth is quite demure, but now CometBFT is coming for our poor hard drives.

While the system requirements for running a full node recommend 1 TB drives, we experienced how unwieldy 200 GB databases are (see post-mortem). For non-archive nodes we should aim to stay well below that, balancing storage growth, performance and maintenance against a high level of integrity and security granted by retaining a large fraction of the chain.

Currently Namada mainnet is in phase 1 with I assume minimal network activity and participants. With those variables CometBFT already grows at about 0.5 GB per day. At this rate it will take under a year, 200 days, to reach 100 GB. I expect database growth to increase dramatically once IBC transactions are enabled in phase 3, and more and more integrations and participants are active. Our (drives') days are counted!

Namada runs on CometBFT v0.37, which does not have fully fleshed out pruning features, if at all. Recently CometBFT v1.0 RC2 has been published, which adds more capable pruning.

Considering the necessary work and time involved to upgrade Namada to CometBFT v1.0 and the opportune time window where the database is still manageable closing in under a year, I suggest to start looking into updating CometBFT not long after Namada phase 5 and the stable release of CometBFT v1.0.