Describe the problem/challenge you have
Vendoring from big repositories takes a long time currently. It would be great if that could be improved when using includePath and excludePath

Describe the solution you'd like

When the user declares includePath or excludePath, and explicitly asks for a sparse checkout, perform a git sparse checkout for them using includePaths and excludePaths (with globs you'd use no cone mode).

Example new config:

apiVersion: 
---
apiVersion: vendir.k14s.io/v1alpha1
kind: Config
directories:
- path: vendor
  contents:
  - path: kubernetes
    git:
      url: https://github.com/yannh/kubernetes-json-schema
      ref: master
      depth: 1
      sparseCheckout: true
    includePaths:
    - v1.30.5-standalone/**

Anything else you would like to add:

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