LOAN-169b - Add concepts related to transition loans, including supporting green projects

[ElisaKendall]

Description

1. Added the general concept of a project to the objectives ontology
2. Add the concept of a green project and link it to the green project use of proceeds concept
3. Add definitions for transition loans, strategies and projects
4. Add the notion of target and observed values as part of SPTs and to support KPI calculations

Fixes: #2074 / LOAN-169

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).