feat(material/core): namespace m2-specific theming APIs

[crisbeto]

These changes rename the theming APIs that are specific to M2 to be prefixed with m2-. Subsequent changes will move the M3 APIs out of experimental and introduce a schematic to automatically migrate users.

BREAKING CHANGE: The following APIs have been renamed. If you update using ng update, your app will be fixed automatically.

• define-light-theme to m2-define-light-theme
• define-dark-theme to m2-define-dark-theme
• define-palette to m2-define-palette
• get-contrast-color-from-palette to m2-get-contrast-color-from-palette
• get-color-from-palette to m2-get-color-from-palette
• get-color-config to m2-get-color-config
• get-typography-config to m2-get-typography-config
• get-density-config to m2-get-density-config
• $red-palette to $m2-red-palette
• $pink-palette to $m2-pink-palette
• $indigo-palette to $m2-indigo-palette
• $purple-palette to $m2-purple-palette
• $deep-purple-palette to $m2-deep-purple-palette
• $blue-palette to $m2-blue-palette
• $light-blue-palette to $m2-light-blue-palette
• $cyan-palette to $m2-cyan-palette
• $teal-palette to $m2-teal-palette
• $green-palette to $m2-green-palette
• $light-green-palette to $m2-light-green-palette
• $lime-palette to $m2-lime-palette
• $yellow-palette to $m2-yellow-palette
• $amber-palette to $m2-amber-palette
• $orange-palette to $m2-orange-palette
• $deep-orange-palette to $m2-deep-orange-palette
• $brown-palette to $m2-brown-palette
• $grey-palette to $m2-grey-palette
• $gray-palette to $m2-gray-palette
• $blue-grey-palette to $m2-blue-grey-palette
• $blue-gray-palette to $m2-blue-gray-palette
• $light-theme-background-palette to $m2-light-theme-background-palette
• $dark-theme-background-palette to $m2-dark-theme-background-palette
• $light-theme-foreground-palette to $m2-light-theme-foreground-palette
• $dark-theme-foreground-palette to $m2-dark-theme-foreground-palette
• define-typography-level to m2-define-typography-level
• define-rem-typography-config to m2-define-rem-typography-config
• define-typography-config to m2-define-typography-config
• define-legacy-typography-config to m2-define-legacy-typography-config
• typography-level to m2-typography-level
• font-size to m2-font-size
• line-height to m2-line-height
• font-weight to m2-font-weight
• letter-spacing to m2-letter-spacing
• font-family to m2-font-family
• font-shorthand to m2-font-shorthand

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