Release EP P2P 1.5.0

Features

• serve one chain only (#140) #140 (Utkir S)
• set up env for test & add basic unit test example (#129) #129 (Utkir S)
• Create pipeline config for EP6 P2P (#158) #158 (Ardian)
• max ipfs cid length (marie-fourier)

Commits

• 9ad43e5: p2p spec updates (#139) (Utkir S) #139
• b398b9f: delete hardcoded mempools & configurable mempool id (#148) (Utkir S) #148
• 1.5.0 (marie-fourier)