Better error handling in makefile for `make up`

[Endogen]

We need better error handling for setting up / starting the node. We should cover:

• Check if cometbft executable is present. If not, tell user in which folder it's expected
• Check if .cometbft folder is present. If not, tell user to execute ./cometbft init
• Check if genesis.json is present. If not, tell user to to execute configure command
• Check if config.toml has a [xian] section. If not, tell user to to execute configure command