feat: add notifications api #32

[Kraigo]

1. Description

Added notifications service

• GET https://mastodon.example/api/v1/notifications
• GET https://mastodon.example/api/v1/notification/:id
• POST https://mastodon.example/api/v1/notifications/clear
• POST https://mastodon.example/api/v1/notifications/:id/dismiss

1.1. Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples.

1.2. Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

1.3. Related Issues

[codecov-commenter]

Codecov Report

Merging #120 (bb17766) into main (c027916) will increase coverage by 0.58%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   72.14%   72.72%   +0.58%     
==========================================
  Files          97       99       +2     
  Lines        1034     1056      +22     
==========================================
+ Hits          746      768      +22     
  Misses        288      288              

Impacted Files	Coverage Δ
lib/src/service/entities/notification.dart	100.00% <100.00%> (ø)
...ice/v1/notifications/notifications_v1_service.dart	100.00% <100.00%> (ø)

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