feat(settings): allow computed pos property for settings sections

[MeguminSama]

This PR allows you to dynamically calculate the position of your settings items (dividers, headers, sections).

Example:

settings.addDivider((sections) => {
  return sections.findIndex((section) => section.section === UserSettingsSections.DEVELOPER_OPTIONS);
});

settings.addHeader("Cool Header", (sections) => {
  return sections.findIndex((section) => section.section === UserSettingsSections.DEVELOPER_OPTIONS);
});

settings.addSection("SectionName", "Section Label",  SectionComponent, null, (sections) => {
  return sections.findIndex((section) => section.section === UserSettingsSections.DEVELOPER_OPTIONS);
});