Re-engineered indexing mechanisms

What's Changed

• Last checked partition by @balaktsis in #2
• Integrate incremental by @mavroudo in #3
• Hotfix a bug for the I table by @mavroudo in #4
• Merge stream by @antliarokapis in #5
• Minor fixes by @balaktsis in #7
• Merge stream by @balaktsis in #6
• Hotfixes by @mavroudo in #8
• Cluster by @mavroudo in #9
• Development by @balaktsis in #11
• modifications in lastchecked. 5x speedup by @mavroudo in #13

New Contributors

• @balaktsis made their first contribution in #2
• @mavroudo made their first contribution in #3
• @antliarokapis made their first contribution in #5

Full Changelog: v2.2.0...v2.3.0