Add end location to line-length violation (StyraInc#981)

This one was particularly bad before, as only the last character on
the line would indicate an issue, making it really hard to see. Now
we flag the whole line.

Signed-off-by: Anders Eknert <anders@styra.com>

bundle/regal/rules/style/line_length.rego

@@ -28,8 +28,12 @@ report contains violation if {
 		{"location": {
 			"file": input.regal.file.name,
 			"row": i + 1,
-			"col": line_length,
+			"col": 1,
 			"text": input.regal.file.lines[i],
+			"end": {
+				"row": i + 1,
+				"col": line_length,
+			},
 		}},
 	)
 }

bundle/regal/rules/style/line_length_test.rego

@@ -20,8 +20,11 @@ foo == bar; bar == baz; [a, b, c, d, e, f] := [1, 2, 3, 4, 5, 6]; qux := [q | so
 		}],
 		"title": "line-length",
 		"location": {
-			"col": 103, "file": "policy.rego", "row": 6,
+			"col": 1,
+			"file": "policy.rego",
+			"row": 6,
 			"text": `foo == bar; bar == baz; [a, b, c, d, e, f] := [1, 2, 3, 4, 5, 6]; qux := [q | some q in input.nonsense]`,
+			"end": {"col": 103, "row": 6},
 		},
 		"level": "error",
 	}}
@@ -50,9 +53,11 @@ test_fail_line_too_long_but_below_breakable_word_threshold if {
 		"description": "Line too long",
 		"level": "error",
 		"location": {
-			"col": 56,
+			"col": 1,
 			"file": "policy.rego",
-			"row": 7, "text": "\t# Long url: https://www.example.com/this/is/a/very/long",
+			"row": 7,
+			"text": "\t# Long url: https://www.example.com/this/is/a/very/long",
+			"end": {"col": 56, "row": 7},
 		},
 		"related_resources": [{
 			"description": "documentation",
@@ -73,10 +78,12 @@ test_fail_line_exceeds_120_characters_even_if_not_in_config if {
 		"description": "Line too long",
 		"level": "error",
 		"location": {
-			"col": 147,
+			"col": 1,
 			"file": "policy.rego",
+			"row": 5,
 			# regal ignore:line-length
-			"row": 5, "text": "# Long url: https://www.example.com/this/is/a/very/long/url/that/cannot/be/shortened/and/should/trigger/an/error/anyway/so/that/it/can/be/shortened",
+			"text": "# Long url: https://www.example.com/this/is/a/very/long/url/that/cannot/be/shortened/and/should/trigger/an/error/anyway/so/that/it/can/be/shortened",
+			"end": {"col": 147, "row": 5},
 		},
 		"related_resources": [{
 			"description": "documentation",