Implement Events Handling (#1)

[ilslv]

Part of #1

Synopsis

Firstly we should implement abstractions for Events

Solution

• [x] Traits
  • [x] Event
  • [x] VersionedEvent
  • [x] EventSourced
  • [x] EventInitialised
• [x] Structs
  • [x] InitialEvent wrapper
• [x] Proc macros
  • [x] Event derive
  • [x] VersionedEvent derive
• [x] Toolchain
  • [x] Makefile
  • [x] PR and Issue templates
  • [x] GitHub Actions CI

Checklist

• Created PR:
  • [x] In draft mode
  • [x] Name contains Draft: prefix
  • [x] Name contains issue reference
  • [x] Has k:: labels applied
  • [x] Has assignee
• [x] Documentation is updated (if required)
• [x] Tests are updated (if required)
• [x] Changes conform code style
• [x] CHANGELOG entry is added (if required)
• [x] FCM (final commit message) is posted
  • [x] and approved
• [x] Review is completed and changes are approved
• Before merge:
  • [x] Milestone is set
  • [x] PR's name and description are correct and up-to-date
  • [x] Draft: prefix is removed
  • [x] All temporary labels are removed

[ilslv]

FCM

Implement Events Handling (#1, #2)

- Traits
  - Event
  - VersionedEvent
  - EventSourced
  - EventInitialised
- Structs
  - InitialEvent wrapper
  - EventVersion
- Proc macros
  - Event derive
  - VersionedEvent derive
- Toolchain
  - Makefile
  - GitHub Actions CI