[PROPOSAL] export a pimo play sandbox as venom test

This is a proposal to add link in the pimo play page to export current status as non regression test in venom test.

We could create a drop-down buttons list on the upper right corner (similar to https://jqplay.org/).
Buttons :

- Share : copy link
- Export as Venom Test

**The venom test is :**

```yaml
name: "test generated from pimoplay "
testcases:
- name: declaring cache
steps:
- script: rm -f masking.yml
- script: |-
cat > masking.yml <
EOF
- script: |-
cat > input.jsonl <
EOF
- script: |-
cat > expected.jsonl <
EOF
- script: |-
< input.jsonl pimo > result.jsonl
assertions:
- result.code ShouldEqual 0
- script: |-
diff expected.jsonl result.jsonl
assertions:
- result.code ShouldEqual 0
- result.systemout ShouldBeEmpty
```

Start with the pimo play page described in the issue and review linked pull request #178 to understand the work already underway. Done means the page can share its current state and export the masking, input, and expected cells as a runnable Venom test matching the shown structure.

Written by the indexing model from the issue text.