feat: State sync APIs should use encoded Ops

[ogabrielides]

Issue being fixed or feature implemented

Platform ABCI isn't aware of Ops structure. Therefore, grovedb state sync related APIs should always use encoded into bytes ops.

What was done?

Wrote utility functions util_encode_vec_ops and util_decode_vec_ops and adjusted fetch_chunk and apply_chunk.

How Has This Been Tested?

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone