Support multiple cache key files via glob patterns

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Currently, the cache:key:files feature supports "up to a maximum of two files" and they must be specified without glob patterns:

cache:
  paths: [ .nuget/packages ]
  key:
    prefix: linux-nuget
    files:
      - .config/dotnet-tools.json
      - packages.lock.json

It would be really nice to remove the limit and support glob patterns:

cache:
  paths: [ .nuget/packages ]
  key:
    prefix: linux-nuget
    files:
      - "**/dotnet-tools.json"
      - "**/packages.lock.json"

In particular, this is needed because each .NET project has its own lock file, and a .NET solution may contain many projects in subdirectories.