Add EndpointAuthType enum for endpoint authentication types

Introduced the EndpointAuthType enum in the ReC.Domain.Constants namespace to represent various endpoint authentication methods, including NoAuth, ApiKey, BearerToken, JwtBearer, BasicAuth, DigestAuth, OAuth1, OAuth2, AwsSignature, and NtlmAuth. Each type is assigned a unique integer value for clear identification.

src/ReC.Domain/Constants/EndpointAuthType.cs

@@ -0,0 +1,15 @@
+namespace ReC.Domain.Constants;
+
+public enum EndpointAuthType
+{
+    NoAuth = 0,
+    ApiKey = 1,
+    BearerToken = 2,
+    JwtBearer = 3,
+    BasicAuth = 4,
+    DigestAuth = 5,
+    OAuth1 = 6,
+    OAuth2 = 7,
+    AwsSignature = 8,
+    NtlmAuth = 9
+}