Framework agreements: Clarify that "bundled" notices require different OCIDs

[jpmckinney]

For example, in the EU, it's possible to make multiple independent call-offs relating to the same lot over a given period, and to then report all the awards at once in one notice.

The general rule is that you can bundle awards within a 30-day window. Furthermore, for contracts within framework agreements and dynamic purchasing systems, this may be extended to a quarterly window instead (the details are in Art. 50 of Directive 2014/24/EU). open-contracting-extensions/european-union#94 (comment)

Even though there is one notice, each call-off needs to be modelled as a separate OCID. This is expressed in our framework agreement guidance already, but we might want to address the specific case of bundled notices.

If not separated by OCID, the single lot would have multiple awards in the same contracting process. Each of those competitions could have a different number of bids. In the current model, as used in V.2.2 of the EU profile, these statistics would conflict with each other, because the bid statistics are per lot, not per award.

This came up in CRM-7416 with these examples:

https://www.find-tender.service.gov.uk/Notice/002763-2021
https://www.find-tender.service.gov.uk/api/1.0/ocdsReleasePackages/ocds-h6vhtk-029232

Note that "Multiple awards, possibly with multiple bid statistics, could also happen in other cases where you have multiple rounds of competitions - innovative partnerships and competitive dialogues" open-contracting-extensions/european-union#94 (comment) We haven't seen such procedures yet, but we might need to add relatedAward to the bid Statistic object.

This issue is moved from open-contracting-extensions/european-union#94