Add missing semantic colors / find semantic alternative.

# Context

Element X Android is using color directly from the token and not from Semantic colors because they do not exist, or we did not find a match when implementing the screens.

The colors are defined here https://github.com/element-hq/element-x-android/blob/develop/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/theme/ColorAliases.kt#L40, but the table below lists the colors, their value and their usage.

# Table of alias (Android)

|Name|Light|Dark|Usage|screenshot|
|-|-|-|-|-|
|messageFromMeBackground|LightColorTokens.colorGray400|DarkColorTokens.colorGray500|Background of the bubble, message from the current user||
|messageFromOtherBackground|LightColorTokens.colorGray300|DarkColorTokens.colorGray400|Background of the bubble, message from other users||
|progressIndicatorTrackColor|LightColorTokens.colorAlphaGray500|DarkColorTokens.colorAlphaGray500|Track color of the progress indicator|
|iconSuccessPrimaryBackground|LightColorTokens.colorGreen300|DarkColorTokens.colorGreen300|Background of formatting option, when selected||
|bgSubtleTertiary|LightColorTokens.colorGray100|DarkColorTokens.colorGray100|Background for code or quoted text in the timeline|
|temporaryColorBgSpecial|Color(0xFFE4E8F0)|Color(0xFF3A4048)|Background of big icon||
|pinDigitBg|LightColorTokens.colorGray300|DarkColorTokens.colorGray400|Background for the pin code digit||
|currentUserMentionPillText|LightColorTokens.colorGreen1100|DarkColorTokens.colorGreen1100|Text in pills|
|currentUserMentionPillBackground|Color(0x3b07b661)|Color(0xff003d29)|Background for pills|
|mentionPillBackground|Color(0x1f052e61)|Color(0x26f4f7fa)|Background for pills|
|bigCheckmarkBorderColor|LightColorTokens.colorGray400|DarkColorTokens.colorGray400|Used in BigCheckmark, but this component is not used, we should remove it?|
|highlightedMessageBackgroundColor|LightColorTokens.colorGreen300|DarkColorTokens.colorGreen300|Background for higlighted message gradient (note: for Element Pro we use textActionAccent.copy(alpha = 0.125f)|
|badgeNeutralBackgroundColor|LightColorTokens.colorAlphaGray300|DarkColorTokens.colorAlphaGray300|Background for neutral badge||
|badgeNeutralContentColor|LightColorTokens.colorGray1100|DarkColorTokens.colorGray1100|Text/icon for neutral badge||
|badgeNegativeBackgroundColor|LightColorTokens.colorAlphaRed300|DarkColorTokens.colorAlphaRed300|Background for negative badge||
|badgeNegativeContentColor|LightColorTokens.colorRed1100|DarkColorTokens.colorRed1100|Text/icon for negative badge||
|pinnedMessageBannerIndicator|LightColorTokens.colorAlphaGray600|DarkColorTokens.colorAlphaGray600|Color of not selected pinned message||
|pinnedMessageBannerBorder|LightColorTokens.colorAlphaGray400|DarkColorTokens.colorAlphaGray400|Horizontal divider for pinned message banner||

# DOD

All the colors above are removed from the codebase and are replaced by Semantic colors, either new or existing ones.