Refactor/mempool processing refactoring

[SirTLB]

Description and Motivation

This PR refactors the mempool decoding, filtering and processing on the tracked pools. It makes sure logic is not applied at two different locations in the code. Also, it introduces GRPC and REST endpoint provision for Injective defaults overwrite. Will be implemented later

Related Issues

69

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• [x] I have read Migaloo's contribution guidelines.
• [x] My pull request has a sound title and description (not something vague like Update index.md)
• [x] All existing and new tests are passing (if any).
• [x] I updated/added relevant documentation.
• [x] The code is formatted properly using eslint