Fix Layout/SpaceInsideBlockBraces for blocks with numbered arguments

The `Layout/SpaceInsideBlockBraces` was not being applied for blocks with
numbered arguments as they have AST node type of `numblock` and the cop
only ran for `block` nodes.

At Dext we caught spacing errors during code review and wandered why the
cop didn't run at all. The piece of code was in the lines of

```ruby
Tax.where(condition).partition {_1.by_something}
```

Not running Layout/SpaceInsideBlockBraces for `numblock` nodes was the
cause.

changelog/fix_space_inside_block_braces_with_numbered_arguments.md

@@ -0,0 +1 @@
+* [#10736](https://github.com/rubocop/rubocop/pull/10736): Fix Layout/SpaceInsideBlockBraces for blocks with numbered arguments. ([@gsamokovarov][])

lib/rubocop/cop/layout/space_inside_block_braces.rb

@@ -98,6 +98,8 @@ def on_block(node)
           check_inside(node, left_brace, right_brace)
         end
 
+        alias on_numblock on_block
+
         private
 
         def check_inside(node, left_brace, right_brace)
@@ -126,7 +128,7 @@ def adjacent_braces(left_brace, right_brace)
         end
 
         def braces_with_contents_inside(node, inner)
-          args_delimiter = node.arguments.loc.begin # Can be ( | or nil.
+          args_delimiter = node.arguments.loc.begin if node.block_type? # Can be ( | or nil.
 
           check_left_brace(inner, node.loc.begin, args_delimiter)
           check_right_brace(inner, node.loc.begin, node.loc.end, node.single_line?)

spec/rubocop/cop/layout/space_inside_block_braces_spec.rb

@@ -90,6 +90,20 @@
     end
   end
 
+  context 'Ruby >= 2.7', :ruby27 do
+    it 'registers an offense for numblocks without inner space' do
+      expect_offense(<<~RUBY)
+        [1, 2, 3].each {_1 * 2}
+                        ^ Space missing inside {.
+                              ^ Space missing inside }.
+      RUBY
+
+      expect_correction(<<~RUBY)
+        [1, 2, 3].each { _1 * 2 }
+      RUBY
+    end
+  end
+
   it 'accepts braces surrounded by spaces' do
     expect_no_offenses('each { puts }')
   end