feature(encoder): Implement Iterator over DaBlob for EncodedData

[AlejandroCabeza]

1. What does this PR implement?

Implement Iterator over DaBlob for EncodedData
Closes: #943

2. Does the code have enough context to be clearly understood?

Yes

3. Who are the specification authors and who is accountable for this PR?

@AlejandroCabeza

4. Is the specification accurate and complete?

N/A

5. Does the implementation introduce changes in the specification?

N/A

Checklist

Warning

Do not merge the PR if any of the following is missing:

• 1. Description added.
• 2. Context and links to Specification document(s) added.
• 3. Main contact(s) (developers and specification authors) added
• 4. Implementation and Specification are 100% in sync including changes. This is critical.
• 5. Link PR to a specific milestone.

[danielSanchezQ]

Implementation looks ok, but having an iteration state inside that structure is wrong. What happens if I need 5 iterators over it? You will need to add 5 states then...

[danielSanchezQ]

Looking good, thanks!
We can use this in the executor now. Probably something to do when merging this. Please add an issue and attach to the ongoing iteration.