Fix DDO: Stats and Prices for exchanges/dispensers

[mariacarmina]

Fixes #525 .

Changes proposed in this PR:

• Create type for IndexedMetadata
• Delete key when validating DDO & compose metadata hash
• Update logic for MetadataCreated, MetadataUpdated, OrderStarted, OrderReused
• Fixed hardcoded service[0].datatokenAddress when inserting the DDO in the DB -> you can have multiple datatokens attached to the same NFT with different services
• Add new util function to return service id based on datatoken address
• Create util function which returns the ddo updated with according stats

[mariacarmina]

For the moment only ocean-cli test regarding getDDO fails:
To be more precise at this check https://github.com/oceanprotocol/ocean-cli/blob/main/test/consumeFlow.test.ts#L144

Ocean CLI Publishing
    ✔ should publish a dataset using 'npm run cli publish' (3446ms)
    ✔ should publish a compute dataset using 'npm run cli publish' (3099ms)
    ✔ should publish a js Algorithm using 'npm run cli publishAlgo' (3025ms)
    ✔ should publish a python Algorithm using 'npm run cli publishAlgo' (3042ms)
    1) should get DDO using 'npm run cli getDDO' for download dataset


  4 passing (3m)
  1 failing

  1) Ocean CLI Publishing
       should get DDO using 'npm run cli getDDO' for download dataset:
     Uncaught AssertionError: expected '\n> [email protected] cli\n> TS_NODE_PR…' to include 'https://w3id.org/did/v1'
      at /home/runner/work/ocean-node/ocean-node/ocean-cli/test/consumeFlow.test.ts:144:31
      at ChildProcess.exithandler (node:child_process:414:7)
      at ChildProcess.emit (node:events:5[19](https://github.com/oceanprotocol/ocean-node/actions/runs/12207966655/job/34060344250#step:20:20):28)
      at ChildProcess.emit (node:domain:488:12)
      at maybeClose (node:internal/child_process:1105:16)
      at Process.ChildProcess._handle.onexit (node:internal/child_process:305:5)

I'll put this in review to see if for Metadata events and Order events, I implemented as expected on the specs.
Still FixedRateExchange and Dispenser events needs to be monitored (WIP) along with tests for fixed rate exchange & dispenser pricing schemas.

[jamiehewitt15]

Have you looked into why the tests are failing?

[mariacarmina]

Have you looked into why the tests are failing?

Yes, of course I looked into the failure. They fail because on ExchangeCreate event decodedData of the event is null and I cannot retrieve the exchange id -> the event name is wrong