Pull request #40: ISGAPPSEC2-35640 Accessing client_stream_profile settings in UDP stream app results in exception

Merge in ISGAPPSEC/cyperf-api-wrapper from bugfix/ISGAPPSEC2-35640-accessing-client_stream_profile-settings-in-udp-stream-app-results-in to main

Squashed commit of the following:

commit 83fded9a32a9c5961ba2c2a8c73b181ac0fd0c1d
Author: iustmitu <iustin.mitu@keysight.com>
Date:   Tue Sep 23 16:29:23 2025 +0300

    changed LESS_THAN_NIL_GREATER_THAN -> NULL attribute

Author: Iustin-Mitu

cyperf/models/stream_payload_type.py

@@ -29,7 +29,7 @@ class StreamPayloadType(str, Enum):
     """
     RANDOM = 'RANDOM'
     PSEUDORANDOM = 'PSEUDORANDOM'
-    LESS_THAN_NIL_GREATER_THAN = '<nil>'
+    NULL = 'NULL'
 
     @classmethod
     def from_json(cls, json_str: str) -> Self:

docs/StreamPayloadType.md

@@ -7,7 +7,7 @@
 
 * `PSEUDORANDOM` (value: `'PSEUDORANDOM'`)
 
-* `LESS_THAN_NIL_GREATER_THAN` (value: `'<nil>'`)
+* `NULL` (value: `'NULL'`)
 
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