Configuration file to express existing errors

Similar to https://github.com/GoogleCloudPlatform/cloud-opensource-java/issues/940 but intended to suppress (or ignore) existing linkage errors, rather than special cases.

From Luke's comment in [BEAM-9206](https://issues.apache.org/jira/browse/BEAM-9206?focusedCommentId=17026887&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17026887):

> Typically I have seen people use an ignore list that is hardcoded somewhere such as the ones found in [spotbugs](https://github.com/apache/beam/blob/master/sdks/java/build-tools/src/main/resources/beam/spotbugs-filter.xml) and the test/tool runs and compares against that. This way the the contributor can update the existing list and get the test to pass and the reviewer can see what the edits were so the CL can "pass" all tests.

# Case of Spotbugs-filter

Beam's use case of spotbugs-filter.xml is https://github.com/apache/beam/blob/master/sdks/java/build-tools/src/main/resources/beam/spotbugs-filter.xml

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首先，將所要求的行為與連結的 issue 以及 issue 內文中的 SpotBugs 篩選器範例進行比較。找出現有的 linkage 錯誤在哪裡表示和檢查，接著定義一種設定格式與驗證流程，使完成狀態是在不隱藏新錯誤的情況下抑制已有文件記錄的錯誤。

由索引模型根據 Issue 內容生成。