Support cross-repository reward

[Rustin170506]

Feature Request

Is your feature request related to a Issue or PR(Optional)

• Which project: TiKV

• PR or Issue Link: Add dictionary compression support for blob file tikv/titan#189

Describe the feature you'd like:

Support cross-repository reward.

Do you have any ideas on how to implement it?(Optional)

[ti-chi-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close.
Send feedback to sig-community-infra or hi-rustin.
/lifecycle stale

[ti-chi-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close.
Send feedback to sig-community-infra or hi-rustin.
/lifecycle rotten