misc: remove "pure" requirements from several methods

Due to the current overhead required to make PHPStan and Psalm work with
the pure feature, these requirements have been removed.

Since PHPStan and Psalm are unfortunately unable to automatically
detect whether callable values provided to `MapperBuilder` are pure,
users are forced to manually add `@pure` annotations.

This decision aims to strike a fair balance between the library's
strictness and user experience.

src/Mapper/ArgumentsMapper.php

@@ -8,8 +8,6 @@
 interface ArgumentsMapper
 {
     /**
-     * @pure
-     *
      * @return array<string, mixed>
      *
      * @throws MappingError

src/Mapper/Tree/Message/MessageBuilder.php

@@ -53,9 +53,6 @@ public static function newError(string $body): self
         return $instance;
     }
 
-    /**
-     * @psalm-pure
-     */
     public static function from(Throwable $error): ErrorMessage
     {
         if ($error instanceof ErrorMessage) {
@@ -119,8 +116,6 @@ public function parameters(): array
     }
 
     /**
-     * @psalm-pure
-     *
      * @return MessageType&HasCode&HasParameters
      */
     public function build(): Message&HasCode&HasParameters

src/Mapper/TreeMapper.php

@@ -8,8 +8,6 @@
 interface TreeMapper
 {
     /**
-     * @pure
-     *
      * @template T of object
      *
      * @param string|class-string<T> $signature

src/Mapper/TypeArgumentsMapper.php

@@ -24,7 +24,6 @@ public function __construct(
         private Settings $settings,
     ) {}
 
-    /** @pure */
     public function mapArguments(callable $callable, mixed $source): array
     {
         $function = $this->functionDefinitionRepository->for($callable);

src/Mapper/TypeTreeMapper.php

@@ -23,7 +23,6 @@ public function __construct(
         private Settings $settings,
     ) {}
 
-    /** @pure */
     public function map(string $signature, mixed $source): mixed
     {
         $node = $this->node($signature, $source);

src/MapperBuilder.php

@@ -36,9 +36,6 @@ public function __construct()
      * using the given source. These arguments can then be used to decide which
      * implementation should be used.
      *
-     * The callback *must* be pure, its output must be deterministic.
-     * @see https://en.wikipedia.org/wiki/Pure_function
-     *
      * Example:
      *
      * ```php
@@ -57,7 +54,6 @@ public function __construct()
      * ```
      *
      * @param interface-string|class-string $name
-     * @psalm-param pure-callable $callback
      */
     public function infer(string $name, callable $callback): self
     {
@@ -86,9 +82,6 @@ public function infer(string $name, callable $callback): self
      * needs to be handled as well, the name of the class must be given to this
      * method.
      *
-     * A constructor *must* be pure, its output must be deterministic.
-     * @see https://en.wikipedia.org/wiki/Pure_function
-     *
      * ```php
      * final class SomeClass
      * {
@@ -200,7 +193,6 @@ public function infer(string $name, callable $callback): self
      *     ]);
      * ```
      *
-     * @psalm-param pure-callable|class-string ...$constructors
      * @param callable|class-string ...$constructors
      */
     public function registerConstructor(callable|string ...$constructors): self
@@ -298,7 +290,6 @@ public function withCache(CacheInterface $cache): self
 
     /**
      * @template T
-     * @psalm-param pure-callable(T): T $callback
      * @param callable(T): T $callback
      */
     public function alter(callable $callback): self
@@ -418,9 +409,6 @@ public function allowPermissiveTypes(): self
      * part of a query should never be allowed. Therefore, only an exhaustive
      * list of carefully chosen exceptions should be filtered.
      *
-     * The filter callback *must* be pure, its output must be deterministic.
-     * @see https://en.wikipedia.org/wiki/Pure_function
-     *
      * ```php
      * final class SomeClass
      * {
@@ -446,7 +434,6 @@ public function allowPermissiveTypes(): self
      *     ]);
      * ```
      *
-     * @psalm-param pure-callable(Throwable): ErrorMessage $filter
      * @param callable(Throwable): ErrorMessage $filter
      */
     public function filterExceptions(callable $filter): self
@@ -514,7 +501,6 @@ public function filterExceptions(callable $filter): self
      *     ->normalize('Hello world'); // HELLO WORLD?!
      * ```
      *
-     * @psalm-param pure-callable|class-string $transformer
      * @param callable|class-string $transformer
      */
     public function registerTransformer(callable|string $transformer, int $priority = 0): self