[clang-format] Add `AllowShortNamespacesOnASingleLine` option (#105597) This fixes #101363 which is a resurrection of a previously opened but never completed review: https://reviews.llvm.org/D11851 The feature is to allow code like the following not to be broken across multiple lines: ``` namespace foo { class bar; } namespace foo { namespace bar { class baz; } } ``` Code like this is commonly used for forward declarations, which are ideally kept compact. This is also apparently the format that include-what-you-use will insert for forward declarations. Also, fix an off-by-one error in `CompactNamespaces` code. For nested namespaces with 3 or more namespaces, it was incorrectly compacting lines which were 1 or two spaces over the `ColumnLimit`, leading to incorrect formatting results.
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