Rollup merge of #60995 - topecongiro:parser-from-stream-and-base-dir, r=michaelwoerister

Add stream_to_parser_with_base_dir

This PR adds `stream_to_parser_with_base_dir`, which creates a parser from a token stream and a base directory.

Context: I would like to parse `cfg_if!` macro and get a list of modules defined inside it from rustfmt so that rustfmt can format those modules (cc https://github.com/rust-lang/rustfmt/issues/3253). To do so, I need to create a parser from `TokenStream` and set the directory of `Parser` to the same directory as the parent directory of a file which contains `cfg_if!` invocation. AFAIK there is no way to achieve this, and hence this PR.

Alternatively, I could change the visibility of `Parser.directory` from `crate` to `pub` so that the value can be modified after initializing a parser. I don't have a preference over either approach (or others, as long as it works).

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