Defines the Maverick view of a web request as a struct and helper functions for constructing and handling it. Extracts the details from the Erlang record Elli uses to represent the request and adds or reformats various fields for working in Elixir.

A request contains many of the raw values from the Elli record such as request body as binary or iolist data, the raw request path as a binary, http scheme as binary, and the port number, as well as derived values.

The query parameters, path parameters, and headers are all converted to string-keyed maps and the request body is attempted to be decoded to a map from JSON. The decoded body, path params, and query params are all merged into a single :params map that is the default argument passed to internal functions unless otherwise noted in their decorator.

A Maverick request struct has similarities between both Elli's request record and Plug's Conn struct, generally adhering closer to Elli's data structures (the version of HTTP as a 2-tuple of integers as opposed to a string) but with occasional tradeoffs for ease of compatibility with Elixir (representing the HTTP methods as strings instead of atoms for example).

All parameters derived from user input are converted to string-keyed maps to prevent exhausting the BEAM's atom table.