Create crm mapping drafts (v4)

Draft a field mapping for a CSV's headers and samples or a connected CRM object: each field with its proposed Point11 target and who decided it. A customer attribute is named by its customer catalog key (jobTitle, companySize, buyerRole, ...); an account fact or account context by its own name (industry, context, public_figure_context for a field holding a public figure who owns, founded or fronts the account). With propose, one paid model proposal fills the fields nobody decided, keyed by the Idempotency-Key; save the result with business_crm_mapping_versions_create_v2.