[eCash dev libraries] [p7 ecash-ops] Update package.json repo info

Summary:
T2847

Depends on D12860

Change package name to ecash-minimaldata, add CHANGELOG.md, and remove linter since this is now performed by the monorepo

Test Plan: Sanity check changes (changes are semantic and not to codebase). Confirm npm test works.

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12861