omni-node: add offchain worker

[iulianbarbu]

Description

Copy pasted the parachain-template-node offchain worker setup to omni-node-lib for both aura and manual seal nodes.

Closes #7447

Integration

Enabled offchain workers for both polkadot-omni-node and polkadot-parachain nodes. This would allow executing offchain logic in the runtime and considering it on the node side.

[iulianbarbu]

/cmd prdoc --audience runtime_dev,node_dev --bump patch

[github-actions]

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[iulianbarbu]

/cmd prdoc --audience runtime_dev --bump patch

[serban300]

LGTM !

[skunert]

Nice work!

[paritytech-cmd-bot-polkadot-sdk]

Created backport PR for stable2407:

• [stable2407] Backport #7479 #7501 with remaining conflicts!

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-7479-to-stable2407
git worktree add --checkout .worktree/backport-7479-to-stable2407 backport-7479-to-stable2407
cd .worktree/backport-7479-to-stable2407
git reset --hard HEAD^
git cherry-pick -x 87f4f3f0df5fc0cc72f69e612909d4d213965820
git push --force-with-lease

[paritytech-cmd-bot-polkadot-sdk]

Created backport PR for stable2409:

• [stable2409] Backport #7479 #7502 with remaining conflicts!

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-7479-to-stable2409
git worktree add --checkout .worktree/backport-7479-to-stable2409 backport-7479-to-stable2409
cd .worktree/backport-7479-to-stable2409
git reset --hard HEAD^
git cherry-pick -x 87f4f3f0df5fc0cc72f69e612909d4d213965820
git push --force-with-lease

[paritytech-cmd-bot-polkadot-sdk]

Created backport PR for stable2412:

• [stable2412] Backport #7479 #7503 with remaining conflicts!

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-7479-to-stable2412
git worktree add --checkout .worktree/backport-7479-to-stable2412 backport-7479-to-stable2412
cd .worktree/backport-7479-to-stable2412
git reset --hard HEAD^
git cherry-pick -x 87f4f3f0df5fc0cc72f69e612909d4d213965820
git push --force-with-lease