Make curation data format spec an Ecma standard

Create and anchor a new Ecma TC54 task group for a curation data exchange standard. Create spec. Validate and review with the community. Present standard to Ecma plenary.

No files, tests, or code entry points are identified. Start with the proposed Ecma TC54 task group and determine the project’s process for drafting and reviewing the curation data exchange specification. Done means the task group is anchored, the specification is created and community-reviewed, and the standard is presented to the Ecma plenary.

Written by the indexing model from the issue text.