Tracking issue of default value support for columns

[ygf11]

Describe This Problem

Support default value for columns in Ceresdb.

Proposal

Support default value:

• Column default value option can be a normal Expr.
• Column can reference other columns, regardless what defining orders they are.

As @ShiKaiWi and @jiacai2050 suggest, the full feature is complex, I split it into some small tasks.

• Base implemment of default value for columns #249
• Make default value options work like mysql #250
• Support default value option regardless their defining orders  #251
• Persist final physical exprs after analyzing default value options #259

Additional Context

original issue:

• Can Ceresdb support default value for columns? #210