multiple services - consuming support

[FilipMasar]

partially fixes #16

What was done?

• support multiple services when viewing and downloading the asset (compute type was not tested). Edit asset was not updated yet
• AccessDetails type on AssetExtended was changed to an array (1 accessDetails per each service)
• AccessDetails are filled from offchain metadata (link to ocean-node issue). Previously it was fetched from Subgraph which is no longer supported in ocean-node

---

To publish an asset with multiple services you can use ocean-cli - this PR can help you. You need to do 3 steps:

1. publish asset
2. addService
3. edit metadata to contain offchain

What is missing?

• downloading 2nd, 3rd, ... service doesn't work. Issue created in ocean-node
• filling rest of AccessDetails with real data (isPurchasable, isOwned, validOrderTx, ...)
• testing consuming compute services
• editing asset (editing services) DONE here Edit multiple services #42