feat(stellar): use resolveOrigin shared util

[mikesposito]

Depends on

• feat: add resolveOrigin shared util #275

Explanation

Using resolveOrigin from shared util for Stellar snap

References

TBD

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them