#236/conversation context refactor

[nichgalzin]

Description

Closes #236
This PR involves a refactor of the conversation context to follow the switch statement useReducer pattern. The goal of this was to centralise the state manipulation logic in anticipation of growing project complexity and to set a pattern for future context setup and use.

The main change of this is replacement of all set state actions with a dispatch action and all state related manipulation moved to the conversationStore file.

Files changed

• context/conversationContext.tsx - refactors context to a singe state object and sets provider to return state and dispatch functionality.
• context/conversationStore.ts - sets up the reducer function for context state manipulation
• context/contextTypes.ts - new types file for context specific types
• All other changed files are refactors that remove set state actions and replaces them with dispatched actions and values from this derived state.

Tests

Although this PR contains no new tests, it anticipates the future adoption of Jest for unit testing as this refactor will hopefully greatly simply that process.

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