internal/mapper/oas: Omit empty descriptions and false sensitive values from generated specification (#37)

Reference: #34
Reference: #35

Slight cleanup of generated specification to reduce size where the omitted specification is the same as the desired behavior.

Author: bflad

internal/cmd/testdata/edgecase/generated_framework_ir.json

@@ -31,8 +31,7 @@
 										"name": "string_prop",
 										"string": {
 											"computed_optional_required": "computed_optional",
-											"description": "String inside a map!",
-											"sensitive": false
+											"description": "String inside a map!"
 										}
 									}
 								]
@@ -152,8 +151,7 @@
 										"name": "string_prop",
 										"string": {
 											"computed_optional_required": "computed_optional",
-											"description": "String inside a set!",
-											"sensitive": false
+											"description": "String inside a set!"
 										}
 									}
 								]
@@ -200,8 +198,7 @@
 										"name": "string_prop",
 										"string": {
 											"computed_optional_required": "computed_optional",
-											"description": "String inside a map!",
-											"sensitive": false
+											"description": "String inside a map!"
 										}
 									}
 								]
@@ -243,8 +240,7 @@
 										"name": "string_prop",
 										"string": {
 											"computed_optional_required": "computed_optional",
-											"description": "String inside a set!",
-											"sensitive": false
+											"description": "String inside a set!"
 										}
 									}
 								]