Add proguard rules for native referenced methods in matrix trace canary library

[littledog623]

There are some missing proguard rules for the trace canary library. Some Java class and method names are called from native c++ code, MatrixTracer.cc in specific. So we need to explicit keep those names in proguard, otherwise there will be errors like "java.lang.UnsatisfiedLinkError: JNI_ERR returned from JNI_OnLoad" at the host app side when loading the SO file.

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

littledog seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}