feat: add leader election envionment variables to make them configurable

[ChenRussell]

Fix #3224

add leader election envionment variables to make LeaseDuration、RenewDeadline and RetryPeriod configurable

Checklist:

• My organization is added to USERS.md.

[whynowy]

@ChenRussell - thanks, could you run make codegen to fix the ci?

[ChenRussell]

@ChenRussell - thanks, could you run make codegen to fix the ci?

I can not fix this problem when I run make codegen:

./hack/generate-proto.sh
++++++++++++++++++++++++++++++++
++++ GENERATING PROTO FILES ++++
++++++++++++++++++++++++++++++++
package golang.org/x/tools/cmd/goimports: unrecognized import path "golang.org/x/tools/cmd/goimports": https fetch: Get "https://golang.org/x/tools/cmd/goimports?go-get=1": dial tcp 142.250.69.209:443: i/o timeout