Http Message Laravel Package

Added return types, see https://www.php-fig.org/psr/psr-7/meta/#72-type-additions

Added parameters types, see https://www.php-fig.org/psr/psr-7/meta/#72-type-additions

This tag contains all updates since entering the second review of PSR-7. These include:

• Clarifications to RequestInterface::withUri() specifying that changes MUST also update the Host header unless the $preserverHost flag is true.
• Removal of the various getHeader*() method overrides in RequestInterface, as they are irrelevant with the above change.
• Added verbiage to the RequestInterface class-level docblock indicating that constructors SHOULD attempt to set the Host header in order to ensure the message is valid on initialization.
• RequestInterface::getHeaderLine() MUST return a string (null was allowed previously, which leads to ambiguity of return value).
• ResponseInterface::getReasonPhrase() MUST return a string(null was allowed previously, which leads to ambiguity of return value).
• ResponseInterface::withStatus() now sets the default value of the $reasonPhrase parameter to an empty string (to correspond to the above change).
• UploadedFileInterface::move() was renamed to moveTo(), and the argument renamed to $targetPath; this clarifies intent for the method.
• UriInterface::withPath() has clarifications in the docblock to indicate the four possible path types (empty, root path, relative path, domain-relative — or absolute — path).

• StreamableInterface was renamed to StreamInterface; typehints were updated accordingly.
• ServerRequestInterface::*FileParams() were renamed to *UploadedFiles(). They now expect and return array trees of a new interface, UploadedFileInterface.
• UploadedFileInterface was added to provide compatibility between SAPI and non-SAPI environments with regards to handling upload files.
• A number of clarifications were made on UriInterface with regards to URI component delimiters.

Immutability + URI interface

• null is no longer allowed (per the ML; see also php-fig/fig-standards#367).

• Refactors MessageInterface to only provide getters.
• MessageInterface now defines getBody() to require that it return a StreamableInterface instance.
• Removes Request and Response interfaces
• Provides server-side interfaces:
  • IncomingRequestInterface, which provides accessors for HTTP properties and environment-specific items ($_SERVER, $_GET, $_POST, $_FILES, $_COOKIE, etc), and support for mutable "attributes".
  • OutgoingResponseInterface, which provides both accessors and mutators for all HTTP properties.
• Provides client-side interfaces:
  • OutgoingRequestInterface, which provides accessors and mutators for all HTTP properties.
  • IncomingResponseInterface, which provides accessors for HTTP properties.
• StreamableInterface removes attach().

• Removed references to RFC 2616 (https://github.com/php-fig/fig-standards/pull/346)
• Added [@throws](https://github.com/throws) annotations (https://github.com/php-fig/fig-standards/pull/345)
• Clarify MessageInterface::getHeaders() (https://github.com/php-fig/fig-standards/pull/347)
• Whitespace!!! (https://github.com/php-fig/fig-standards/pull/351)
• Clarify MessageInterface header methods (https://github.com/php-fig/fig-standards/pull/353)
• Clarify superglobal usage (https://github.com/php-fig/fig-standards/pull/354)
• Clarifications in language. (https://github.com/php-fig/fig-standards/pull/356)