[PM-22736] Send password hasher (#6112)

* feat: 
  - Add SendPasswordHasher class and interface
  - DI for SendPasswordHasher to use Marker class allowing us to use custom options for the SendPasswordHasher without impacting other PasswordHashers.
* test: Unit tests for SendPasswordHasher implementation
* doc: docs for interface and comments

Co-authored-by: Maciej Zieniuk <167752252+mzieniukbw@users.noreply.github.com>

src/Core/KeyManagement/Sends/ISendPasswordHasher.cs

@@ -0,0 +1,21 @@
+namespace Bit.Core.KeyManagement.Sends;
+
+public interface ISendPasswordHasher
+{
+    /// <summary>
+    /// Matches the send password hash against the user provided client password hash. The send password is server hashed and the client
+    /// password hash is hashed by the server for comparison <see cref="HashOfClientPasswordHash"/> in this method.
+    /// </summary>
+    /// <param name="sendPasswordHash">The send password that is hashed by the server.</param>
+    /// <param name="clientPasswordHash">The user provided password hash that has not yet been hashed by the server for comparison.</param>
+    /// <returns>true if hashes match false otherwise</returns>
+    /// <exception cref="InvalidOperationException">Thrown if the server password hash or client password hash is null or empty.</exception>
+    bool PasswordHashMatches(string sendPasswordHash, string clientPasswordHash);
+
+    /// <summary>
+    /// Accepts a client hashed send password and returns a server hashed password.
+    /// </summary>
+    /// <param name="clientHashedPassword"></param>
+    /// <returns>server hashed password</returns>
+    string HashOfClientPasswordHash(string clientHashedPassword);
+}