feat: calling other contract without import, but with registered interface

[r3v4s]

with registered (grc20) interface, able to call it without imports

co-worker @mconcat

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (dev/moul/contract-contract-txtar@eddc7ac). Click here to learn what that means.
The diff coverage is n/a.

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