feat: 送信したフォローリクエストを確認できるように (#14856)

* FEAT: Allow users to view pending follow requests they sent

This commit implements the `following/requests/sent` interface firstly
implemented on Firefish, and provides a UI interface to view the pending
follow requests users sent.

* ux: should not show follow requests tab when have no pending sent follow req

* fix default followreq tab

* fix default followreq tab

* restore missing hasPendingReceivedFollowRequest in navbar

* refactor

* use tabler icons

* tweak design

* Revert "ux: should not show follow requests tab when have no pending sent follow req"

This reverts commit e580b92c37f27c2849c6d27e22ca4c47086081bb.

* Update Changelog

* Update Changelog

* change tab titles

---------

Co-authored-by: Lhc_fl <lhcfl@outlook.com>
Co-authored-by: Hazelnoot <acomputerdog@gmail.com>

CHANGELOG.md

@@ -24,6 +24,8 @@
 - Enhance: カタルーニャ語 (ca-ES) に対応
 - Enhance: 個別お知らせページではMetaタグを出力するように
 - Enhance: ノート詳細画面にロールのバッジを表示
+- Enhance: 過去に送信したフォローリクエストを確認できるように  
+  (Based on https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/663)
 - Fix: 通知の範囲指定の設定項目が必要ない通知設定でも範囲指定の設定がでている問題を修正
 - Fix: Turnstileが失敗・期限切れした際にも成功扱いとなってしまう問題を修正  
   (Cherry-picked from https://github.com/MisskeyIO/misskey/pull/768)