DER-117 - The Rights and Warrants ontology is missing the concept of a mini-future certificate

[ElisaKendall]

Description

Added classes for mini-future certificate and constant leverage option to rights and warrants, including 4 subclasses to mini-future per the CFI standard

Fixes: #1946 / DER-117

Checklist:

• [x] I'm familiar with the FIBO developer quide. My contribution meets all the requirements described there.
• [x] My contribution follows the principles of best practices for FIBO.
• [x] My changes have been reconciled with latest master and no merge conflicts remain.
• [x] This PR is related to exactly one issue. The issue is referenced by using a GitHub keyword such as "fixes", "closes", or "resolves".
• [x] Hygiene tests have been applied by a PR with "(WIP)" in title.
• [x] The issue has been tested locally using a reasoner (for ontology changes).