feat : Implementing config for part of services

[AnuRage-git]

Have implemented XxxConfig for /core/src/services/memory as per the issue Tracking issues of RFC-3197: Config #3240. Requesting review.

[dqhl76]

Please solve the CI problem (cargo fmt) and expose config in core/src/services/mod.rs (you can take this as an example)

[Xuanwo]

Thanks a lot for your contribution, here are some suggestions for this PR. Wish you have fun here.

[xyjixyjixyji]

You can directly run cargo fmt under the core directory to format all files under it.

Besides, you need to make clippy happy by fixing the warning emitted by cargo clippy 😀

[AnuRage-git]

@Ji-Xinyou Done. All checks have passed. I was new to Rust so it took some time for me to understand cargo tool functionalities

[Xuanwo]

Thanks!