feat: claude integration (#552)

* feat: bare bones implementation of claude client (WIP)

* feat: client implementation of Claude (WIP)

* fix: add claude to store

* feat: bare bones implementation of claude client (WIP)

* switch eventsource

* Try new method of calling claude with anthropic sdk

* (WIP) Finish initial claude client implementation and api

* debugging update

* fix(ClaudeClient.js): fix prompt prefixes for HUMAN_PROMPT and AI_PROMPT
fix(ClaudeClient.js): refactor buildMessages logic for correct handling of messages
refactor(ClaudeClient.js): refactor buildPrompt method to buildMessages for use in BaseClient sendMessage method
refactor(ClaudeClient.js): refactor getCompletion method to sendCompletion for use in BaseClient sendMessage method
refactor(ClaudeClient.js): omit getMessageMapMethod method for future refactoring
refactor(ClaudeClient.js): remove unused sendMessage method to prefer BaseClient message
fix(askClaude.js): error in getIds method was causing a frontend crash, userMessage was not defined
fix(askClaude.js): import abortMessage function from utils module
feat(askClaude.js): add /abort route to handle message abort requests
feat(askClaude.js): create abortControllers map to store abort controllers
feat(askClaude.js): implement abortAsk function to handle message abort logic
feat(askClaude.js): add onStart callback to handle message start logic
feat(HoverButtons.jsx): add 'claude' as a supported endpoint for branching

* fix(ClaudeClient.js): update defaultPrefix and promptPrefix messages

includes 'Remember your instructions' as Claude is trained to recognize labels preceding colons as participants of a conversation

* Change name from claude to anthropic

* add settings to handleSubmit and models to endpoints

* Implement Claude settings

* use svg for anthropic icon

* Implement abort

* Implement reverse proxy

* remove png icons

* replace web browser plugin

* remove default prefix

* fix styling of claude icon

* fix console error from svg properties

* remove single quote requirement from eslintrc

* fix(AnthropicClient.js): fix labels for HUMAN_PROMPT and AI_PROMPT
feat(AnthropicClient.js): add support for custom userLabel and modelLabel options
feat(AnthropicClient.js): add user_id metadata to requestOptions in getCompletion method
feat(anthropic, AnthropicClient.js): add debug logging

* refactor(AnthropicClient.js): change promptSuffix variable declaration from let to const

* fix(EndpointOptionsDialog.jsx): remove unnecessary code that changes endpointName from 'anthropic' to 'Claude'
fix(utils/index.jsx): fix alternateName value for 'anthropic' from 'Claude' to 'Anthropic'

* fix(AnthropicIcon): fix sizing/rendering/name of anthropic icon

* fix(AnthropicClient.js): change maxContextTokens default value to 99999
fix(AnthropicClient.js): change maxResponseTokens default value to 1500
fix(AnthropicClient.js): remove unnecessary code for setting maxContextTokens and maxResponseTokens based on modelOptions
fix(AnthropicClient.js): change max_tokens_to_sample default value to 1500
fix(anthropic.js): pass endpointOption.token to AnthropicClient constructor

* Update .env.example

* fix(AnthropicClient.js): remove exceeding message when it puts us over the token limit
fix(AnthropicClient.js): handle case when the first message exceeds the token limit
fix(AnthropicClient.js): throw error when prompt is too long
fix(AnthropicClient.js): adjust max tokens calculation to use maxOutputTokens
fix(anthropic.js): remove console.log statement in ask route

* feat(server/index): increase incoming json payload allowed size

---------

Co-authored-by: Danny Avila <messagedaniel@protonmail.com>

.env.example

@@ -107,6 +107,16 @@ CHATGPT_MODELS=text-davinci-002-render-sha,gpt-4
 # By default it will use the node-chatgpt-api recommended proxy, (it's a third party server)
 # CHATGPT_REVERSE_PROXY=<YOUR REVERSE PROXY>
 
+##########################
+# Anthropic Endpoint: 
+##########################
+# Access key from https://console.anthropic.com/
+# Leave it blank to disable this feature.
+# Set to "user_provided" to allow the user to provide their API key from the UI.
+# Note that access to claude-1 may potentially become unavailable with the release of claude-2.
+ANTHROPIC_API_KEY="user_provided"
+ANTHROPIC_MODELS=claude-1,claude-instant-1,claude-2
+
 #############################
 # Plugins:
 #############################