chore!: simplified public key to identity structure

[shumkov]

Issue being fixed or feature implemented

This is preliminary work for the GroveDB proofs integration. The existing structure of the public key to identity IDs structure has several downsides:

1. It doesn't allow to implement of efficient proofs since it requires proofs for both identities and public keys
2. To respond with identities, a separate read from storage requires for each identity, which is not perfect.
3. Storing identity IDs as cbored array requires reading the whole blob, altering and then storing it back. This makes it impossible to predict fees for such logic since we don't know how many IDs are already there.
4. If we have too many IDs, there won't be possible to implement pagination.

Removal of unused getIdentityIdsByPublicKeyHash endpoint and using GroveDB references solve those problems.

What was done?

• Removed getIdentityIdsByPublicKeyHash endpoint.
• Use GroveDB references to connect public keys to identities
• Split StateRepository#storeIdentity to StateRepository#createIdentity and StateRepository#updateIdentity to remove extra read operation.
• Update RS Drive to the latest v0.23-dev (includes fixes, batching and proofs)
• Moved Identity under key 0 to allow future substructures connected to identity

How Has This Been Tested?

Breaking Changes

getIdentityIdsByPublicKeyHash endpoint is removed. getIdentitiesByPublicKeyHash now responds with an array of identities, instead of an array of cbored arrays of identities.

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

[lgtm-com]

This pull request fixes 2 alerts when merging 7844c0f into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging 2dbc228 into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging 95e9117 into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging 3415c92 into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging a17e5e5 into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging 44b90c9 into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging a8d5736 into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging bd9f0fb into 748320c - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class