feat: adding all tables to the docs

docs/tables/mpe_maxkeyvalues.md

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+---
+layout: article
+title: MPE_MAXKEYVALUES
+description: The MPE_MAXKEYVALUES table stores the current maximum surrogate / retained key value for each keyed table in Data Controller for SAS®.
+---
+
+# MPE_MAXKEYVALUES
+
+The `MPE_MAXKEYVALUES` table stores the current maximum surrogate / retained key value for each table configured with a retained key (see [RK_UNDERLYING](/dcc-tables/#rk_underlying)). It is used to generate new key values during loads.
+
+## Columns
+
+ - 🔑 `KEYTABLE char(41)`: Base table in `libref.dataset` format
+ - `KEYCOLUMN char(32)`: The surrogate / retained key field containing the key values
+ - `MAX_KEY num`: Integer value representing the current max RK or SK value in the KEYTABLE
+ - `PROCESSED_DTTM num`: Datetime this value was last updated