update toast component to encapsulate styles and update usages

[siddarthkay]

ref :#16852 (comment)

Setting a colour to toast should be an inbuilt property of the toast component to better align with figma properties.

Please check figma designs before picking this issue up.

ref : https://www.figma.com/file/WQZcp6S0EnzxdTL4taoKDv/Design-System-for-Mobile?type=design&node-id=3928-77614&mode=design&t=koUw7AJxFQ4bjfEy-0

[churik]

Closing as not planned and due to the lack of activity.

Reopen if still relevant.