submissionTerms: define catalog

[JachymHercher]

Based on open-contracting/standard#396 (comment), we should define electronic catalogs in https://extensions.open-contracting.org/en/extensions/submissionTerms/master/. I suggest using a definition based on open-contracting/standard@d54ca05, e.g.

An electronic format (typically prescribed by the buyer) that participants in the contracting process must follow when exchanging information about technical specifications, evaluation criteria, bids, lots, etc.

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Note: the extension uses "catalogue" while the guidance "catalog". Catalog is more popular in US English, so should be the default option, but I'm not sure whether we don't want to stick to catalogue instead because it is already a field (changing a field has bigger impact than changing documentation) and because it is an EU extension and the EU uses "catalogue".

[ColinMaudry]

Beside UK and Scotland, I don't think that the submissionTerms extension has been broadly adopted. I suggest:

• we fix the spelling of "catalog" in the schema
• we inform the adopters we know of

[jpmckinney]

This extension is planned to be merged into OCDS 1.2: open-contracting/standard#1183

We can make/discuss the rename when doing that merge. This is less disruptive to the two publishers, as they can continue using this extension with the original naming. They will only need to rename fields when upgrading to OCDS 1.2.

[jpmckinney]

I've added a definiton to the field description, which closes this issue.

open-contracting-extensions/ocds_submissionTerms_extension@db48678