Part of https://github.com/Azure/azure-sdk-for-cpp/issues/1277, checking what types of warnings the CI emits.
Verified all SDK product `.cpp`, `.hpp`, `.txt`, and `.md` files, primarily focused on azure-core. They are all clean now. There are some exceptions that needs to be added for keyvault and storage, but they are false positives, so not a concern.
> `cspell lint --config .vscode/cspell.json *.hpp */**/*.hpp`
CSpell: Files checked: 188, Issues found: 0 in 0 files
> `cspell lint --config .vscode/cspell.json *.cpp */**/*.cpp`
CSpell: Files checked: 186, Issues found: 88 in 15 files (keyvault and storage false positives, or tests)
> `cspell lint --config .vscode/cspell.json *.md */**/*.md`
CSpell: Files checked: 45, Issues found: 5 in 2 files (eng/common)
> `cspell lint --config .vscode/cspell.json *.txt */**/*.txt`
CSpell: Files checked: 44, Issues found: 0 in 0 files
> `cspell lint --config .vscode/cspell.json *.* */**/*`
CSpell: Files checked: 646, Issues found: 328 in 69 files (most of these are in eng\docs\api\assets\style.css or eng/common)
Deprioritize and ignored the errors from the test files (including test resource json files), and `eng/common` since those need to be centrally fixed.
Usability studies found that static methods are generally not as user-friendly as instance methods. Folks new to the SDK have harder time discovering the APIs, they reverse the flow of typing, and the calling code ends up a bit more verbose because you have to spell out the whole namespace and type name when there aren't any using directives.
There doesn't seem to be a strong benefit or feasibility reason to keep these method statics which are typically harder to use and discover.
cc @kyle-patterson
Part of https://github.com/Azure/azure-sdk-for-cpp/issues/1789
From Jeff:
> BodyStream is only exposed to users when uploading/downloading bytes. Except for Storage almost no services do this at all; they read the stream and deserialize into a structure and the customer gets the structure - not the stream. Azure::Core:IO is a fine namespace.
* Moved `BodyStream` and its derived types from `Azure::Core::Http`
namespace to `Azure::IO`, and update headers.
* Fix up clang formatting.
* Add missing winhttp bodystream namespace change.
* Update merge conflict related changes.
* Update header paths in includes.
