[Milestone 2] Remove encoding and column level stats for blob writers

### Task Description

**What needs to be done:**
Update the writers to ensure that we don't attempt any encodings on the blob inline data. We also don't need to include stats for these fields.

**Why this task is needed:**
Ensures the writers are optimal for this new data type

### Task Type

Code improvement/refactoring

### Related Issues

**Parent feature issue:** (if applicable )
**Related issues:**
NOTE: Use `Relationships` button to add parent/blocking issues after issue is created.

The issue names no files, tests, or entry points; begin by locating the blob-writer implementations and tracing how inline blob fields are encoded and given column statistics. Done means the writers skip both operations for blob inline data and relevant writer tests confirm that behavior.

Written by the indexing model from the issue text.