feat(config): :white_check_mark: Add options configuration for HTTP client

[shijithkjayan]

• Added options configuration to config/config.exs for :ex_typesense application.
• Introduced get_options/0 function in ExTypesense.HttpClient to fetch the options configuration.
• Updated HTTP request construction in ExTypesense.HttpClient to include options.
• Added tests for get_options/0 in ExTypesense.HttpClientTest.

This change allows for additional configuration options to be passed to the HTTP client, enhancing its flexibility and configurability.