[vcpkg] Implement VersionedPortfileProvider and BaselineProvider (#14123)

* WIP: Get versions from database files

* Fix formatting

* Provider inherits ResourceBase

* Correct versions JSON file location

* Fix formatting

* Fix formatting

* Fix include in versions.h

* Fetch port versions using git tree object

* Undo changes to x-history

* Remove unnecesary moves

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* Extract Git manipulation code

* [WIP] Review comments

* [WIP] Review comments pt. 2

* [WIP] Review comments / fix formatting

* Generate baseline.json

* Extract deserializers from registries source file

* BaselineProvider initial implementation

* Modify gitignore

* Update .gitignore again

* Use JSON deserializer for versions db

* Lazy load baseline file

* Fetch baseline.json from baseline commit

* More git abstractions

* Clean up code

* Path helpers

* Formatting

* Move data into impl object

* Use implementation object for VersionedPortfileProvider

* Reuse cloned instance for checkouts

* Code cleanup and formatting

* Fix returning dangling reference

* Prepare to remove files in port_versions/

* Remove files in port_versions/

* Update .gitignore

* Some PR review comments

* Use StringView

* More StringView conversions

* More refactoring

* Make some implementation members private

* Functions for parsing baseline and version files

* Hide deserializers implementation

* Check for `versions` feature flag in registries.

Co-authored-by: Robert Schumacher <roschuma@microsoft.com>
Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

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