Add basic indentation rules

Indentation Rules.tmPreferences

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+<?xml version="1.0" encoding="UTF-8"?>
+<plist version="1.0">
+<dict>
+	<key>scope</key>
+	<string>source.hcl, source.terraform, source.terraform-vars</string>
+	<key>settings</key>
+	<dict>
+		<key>decreaseIndentPattern</key>
+		<string>^\s*[])}]</string>
+		<key>increaseIndentPattern</key>
+		<string><![CDATA[(?x)
+			^.*            # anything on the line followed by:
+			(
+			  \[[^]"']*    # an open square bracket not followed by a closing square bracket or string punctuation
+			| \([^)"']*    # an open bracket not followed by a closing bracket or string punctuation
+			| \{[^}"']*    # an open curly brace not followed by a closing brace or string punctuation
+			)$
+		]]></string>
+		<key>indentParens</key>
+		<false/>
+		<key>indentSquareBrackets</key>
+		<false/>
+	</dict>
+</dict>
+</plist>

tests/syntax_test_reindent.tf

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+# SYNTAX TEST reindent-unchanged "Terraform.sublime-syntax"
+
+provider "name" {
+  attr1 = {
+    key1 = {
+      key11 = {
+        key111 = 0
+        key112 = [
+          "0",
+          "1"
+        ]
+      },
+      key12 = [
+        0,
+        1,
+      ],
+      key13 = (
+        var.member
+        + var.other
+      )
+    }
+  }
+
+  attr2 = jsondecode(
+    {
+      "key1": {
+        "key11": [
+          0,
+          1
+        ],
+        "key12": {
+          "key121": "value",
+          "key122": 0
+        }
+      }
+    }
+  )
+}