MDEV-13631 Make use of clang-format

Add .clang-format files to a root directory and to storage/innobase

Author: kevgs

.clang-format

@@ -0,0 +1,18 @@
+SpaceBeforeAssignmentOperators: false
+SpaceAfterCStyleCast: true
+
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterClass: true
+  AfterControlStatement: true
+  AfterEnum: true
+  AfterFunction: true
+  AfterNamespace: true
+  AfterStruct: true
+  AfterUnion: true
+  AfterExternBlock: true
+  BeforeCatch: true
+  BeforeElse: true
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true

storage/innobase/.clang-format

@@ -0,0 +1,10 @@
+UseTab: Always
+TabWidth: 8
+IndentWidth: 8
+BreakBeforeBinaryOperators: All
+PointerAlignment: Left
+AlwaysBreakAfterReturnType: TopLevel
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterFunction: true
+AccessModifierOffset: -8