fix: add logic to handle roleChange event in stream

[mohammeds1992]

Fixes Issue

Changes proposed

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• My code follows the code style of this project.
• My change requires changes to the documentation.
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Note to reviewers

[github-actions]

• In the DataModifier class, there are several missing closing braces for the methods mapToJoinGroupEvent, mapToLeaveGroupEvent, mapToRequestEvent, mapToRemoveEvent, and mapToRoleChangeEvent. Please add closing braces for these methods.

• In the mapToLeaveGroupEvent method, there is no implementation. Please add the necessary code for this method.

• In the mapToRequestEvent method, there is a misplaced closing brace. Move the closing brace before the if condition, after the line eventData.raw = { verificationProof: data.verificationProof };.

• In the mapToRemoveEvent method, there is no implementation. Please add the necessary code for this method.

• In the buildChatGroupEventMetaAndRaw method, there is a missing closing brace for the raw variable declaration. Please add a closing brace after the line const raw: GroupEventRawData = { verificationProof: incomingData.verificationProof };.

• In the buildChatGroupEventMetaAndRaw method, there is an unreachable return statement after the line return { meta };. Please remove this return statement as it is not necessary.

• In the mapToGroupEvent method, there is a missing closing brace after the line chatId: incomingData.chatId,. Please add a closing brace for this object initialization.

• In the pushStreamTypes.ts file, there is a missing closing brace for the SPAM enum value in the NotificationEventType enum. Please add a closing brace after the line 'notification.spam',.

• In the pushStreamTypes.ts file, there is a missing closing brace for the RETRY_APPROVE enum value in the VideoEventType enum. Please add a closing brace after the line 'video.retry.approve'.