Add props to change default section header colors

[YoussefHenna]

Important

Add props to customize section header colors in SectionList and DefaultSectionHeader.

• Behavior:
  • Adds sectionHeaderBackgroundColor and sectionHeaderTextColor props to SectionList in SectionList.tsx.
  • Updates DefaultSectionHeader in SectionHeader.tsx to use backgroundColor and textColor props, defaulting to theme colors if not provided.
• Components:
  • SectionList now passes sectionHeaderBackgroundColor and sectionHeaderTextColor to DefaultSectionHeader.
  • DefaultSectionHeader uses these props to set text and background colors.

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