feat!: remove nip-26 delegation support

[cameri]

Description

Remove support for NIP-26 Delegation.

Related Issue

None

Motivation and Context

The current usage of NIP-26 does not merit the performance loss incurred for all queries and inserts.

How Has This Been Tested?

1. Unit tests
2. Integration tests
3. Sending events to a live Nostream instance

Screenshots (if appropriate):

Types of changes

• Non-functional change (docs, style, minor refactor)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my code changes.
• All new and existing tests passed.

[coveralls]

Pull Request Test Coverage Report for Build 7497305858

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.7%) to 53.542%

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Totals
Change from base Build 7496762592:	-1.7%
Covered Lines:	1216
Relevant Lines:	2228

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💛 - Coveralls

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

The release is available on GitHub release

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