Agents using Agent blocks should be seamlessly downloaded from the
marketplace to a file and imported from a file.
Requirements:
* A recursive export process that exports all the required agents to a
single file, no matter how many layers deep (taking care of potential
loops).
* An import process that expects and extracts several agents from a
single file into your library at once.
Considerations:
We need to ensure the reference IDs in the Agent Blocks match/are
updated to match the imported sub-agent ids to prevent broken
references.
### Changes 🏗️
* Add sub_graphs field on Graph model
* Improve graph creation query to support inserting graph + subgraphs in
batch
* Deprecate graph template & remove its column
* Update on marketplace download agent (unified the used method, with
more secure cleanup & proper ownership check).
* Fix failing test cases
### Checklist 📋
#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
<!-- Put your test plan here: -->
- [x] Export graph with sub agents.
- [x] Import the exported graph with sub agents.
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