chore: import upstream snapshot with attribution

.help/docs/operators/lib/flow/context/SetStringVar.md

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+# SetStringVar
+
+*in [Lib.flow.context](README.md)*
+
+Writes a string value to the context's float variable dictionary.
+Use [GetStringVar] to read this value further down the graph.
+
+Example: [SetContextVariableExample]
+
+## Input Parameters
+| Name (Relevancy & Type) | Description |
+|---|---|
+| **StringValue** (String) | String value of this variable |
+| **VariableName** (String) | The name to set for the variable. So it can be referenced to later in the graph. |
+| **SubGraph** (Command) | Optional sub-graph so this can be used between different command operators (Execute, etc.). |
+| **ClearAfterExecution** (Boolean) | — |
+
+## Outputs
+| Name | Type |
+|---|---|
+| **Output** | T3.Core.DataTypes.Command |
+