feat(pam): add AWS IAM resource documentation and form enhancements

- Introduced a new documentation page for configuring AWS IAM access through Infisical PAM, detailing the setup process and key concepts.
- Updated the AWS IAM account form to validate session duration input, allowing users to specify durations in human-readable formats (e.g., 15m, 1h).
- Added new images for resource creation and account setup in the documentation.
- Enhanced the form's default session duration handling to improve user experience.

docs/docs.json

@@ -795,6 +795,12 @@
                   "documentation/platform/pam/product-reference/session-recording",
                   "documentation/platform/pam/product-reference/credential-rotation"
                 ]
+              },
+              {
+                "group": "Resources",
+                "pages": [
+                  "documentation/platform/pam/resources/aws-iam"
+                ]
               }
             ]
           }