tablecodec: move meta constant to common place (#15048)
tablecodec: move meta constant to common place (#15048)


XuHuaiyu/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb,c4pt0r/tidb,kyle-wang/tidb,pingcap/tidb,XuHuaiyu/tidb,ngaut/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,kyle-wang/tidb,coocood/tidb,pingcap/tidb,coocood/tidb,EvilMcJerkface/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb