Add configuration to enable conflict resolution per entity type and bundle

Problem/Motivation

Currently, the Conflict module enables conflict resolution for all content entities by default. There is no way to limit it to specific entity types or bundles.

On many sites, conflict resolution is only needed for a subset of entities, so it would be useful if the module allowed administrators to configure it with more granularity. Applying conflict handling broadly to all content entities may also introduce unnecessary performance overhead for entity types and bundles where it is not required.

Proposed resolution

A more granular configuration approach already exists in the content_lock contrib module.
Conflict could implement a similar configuration pattern to allow enabling conflict resolution only for selected entity types and bundles.