Add feature to select channels to log (#4302)

* Add checkbox for custom logging and table with channels to log on Logs page

* Add checkbox to enable and disable logging per channel

* Return from addMessage before logging if custom logging enabled and channel does not have logging enabled

* Use clang-format to fix formatting

* Add CHANGELOG.md entry

* Resolve PR comments

* Remove toggle for channels so any channel listed will be logged

* Move Only log channels listed below checkbox to just above table

* Fix formatting

* Re-order changelog

* ChannelLog constructor: Copy & move instead of const ref & copy

* ChannelLog::createEmpty: Curly brace initialize instead of repeating
name

* ChannelLog toString & createEmpty: nodiscard

* Use COUNT paradigm in model column

* Remove ChanneLoggingModel source file comments

* Use Column::Channel in getRowFromItem

* Rename `getItemFromRow` parameter and mark it as unused

* Curly brace initialize ChannelLog

* private & friend class the model

* Filter out channels to log using a set instead of iterating over a vector every time a message comes in

* Rename `ChannelLog::channel` member to `ChannelLog::channelName`

Also made it private

* mini comment on ChannelLog

Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/singletons/Settings.cpp

@@ -25,6 +25,7 @@ ConcurrentSettings::ConcurrentSettings()
     , filterRecords(*new SignalVector<FilterRecordPtr>())
     , nicknames(*new SignalVector<Nickname>())
     , moderationActions(*new SignalVector<ModerationAction>)
+    , loggedChannels(*new SignalVector<ChannelLog>)
 {
     persist(this->highlightedMessages, "/highlighting/highlights");
     persist(this->blacklistedUsers, "/highlighting/blacklist");
@@ -36,6 +37,7 @@ ConcurrentSettings::ConcurrentSettings()
     persist(this->nicknames, "/nicknames");
     // tagged users?
     persist(this->moderationActions, "/moderation/actions");
+    persist(this->loggedChannels, "/logging/channels");
 }
 
 bool ConcurrentSettings::isHighlightedUser(const QString &username)