Add Table Operations to allow reading data via IceLake

[Xuanwo]

icelake 0.0.1 added most types that we need to load table metadata. We need to implement table operations to allow users reading data via us.

Tasks

• Get current table metadata
• Get all snapshots of current table metadata
• Get all manifest lists from current snapshot
• feat: Add current data files support #31

Notes

• We will not add partition support before v0.1, so we can ignore partition spec and sorting order.
• API should be polished after.

[Xuanwo]

Closing for #279