allow permissionless asset

[zqhxuyuan]

Description

---

Before we can approve this PR for merge, please make sure that all the following items have been checked off:

• Connected to an issue with discussion and accepted design using zenhub "Connect issue" button below
• Added one label out of the L- group to this PR
• Added one or more labels from the A- and C- groups to this PR
• Explicitly labelled A-calamari and/or A-manta if your changes are meant for/impact either of these (CI depends on it)
• Re-reviewed Files changed in the Github PR explorer.
• Add A-integration-test-checks to run start-integration-test-checks (Required)
• Add A-benchmark-checks to run start-benchmark-check (Required)
• Add A-unit-test-checks to run start-unit-test-checks (Required)
• Add A-congestion-test-checks to run start-integration-test-checks (Optional)

Situational Notes:

• If adding functionality, write unit tests!
• If importing a new pallet, choose a proper module index for it, and allow it in BaseFilter. Ensure every extrinsic works from front-end. If there's corresponding tool, ensure both work for each other.
• If needed, update our Javascript/Typescript APIs. These APIs are officially used by exchanges or community developers.
• If modifying existing runtime storage items, make sure to implement storage migrations for the runtime and test them with try-runtime. This includes migrations inherited from upstream changes, and you can search the diffs for modifications of #[pallet::storage] items to check for any.

[github-actions]

Please signoff on all commits with your name, email and gpg key for the Developer's Certificate of Origin.
git config --global user.name your_name
git config --global user.email you_email
COMMAND : git commit -s -S -m your_commit_message
-s = Signed-off-by
-S = Verify commit using gpg key
If there is more than one commit in your pull request and your git client is modern enough (2.13+), rebase the required number of commits with --signoff:
git rebase --signoff -S HEAD~<number_of_commits>
Then, force push:
git push -f origin <your_branch>
For instructions on managing gpg signature verification please visit: https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits