sched: programmable: Add lib for sched programmable

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5KUFB


CVE: NA

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Add lib for sched programmable, this functions help user
program more easily.

The main functions are as follows:
1.Wrap the helper functions make more easily to use.
2.Implement some generic methods and policies for scheduler.

Signed-off-by: Chen Hui <judy.chenhui@huawei.com>
Signed-off-by: Hui Tang <tanghui20@huawei.com>