Add safety to CDFE and DBFE Writers

[mbaker3]

Both the CDFEWriter and DBFEForExclusiveWriterequire have theNativeDisableContainerSafetyRestriction` attribute applied to their lookups. Apply the safety system to the writer/reader level and allow them to co-exist if part of they are part of the same root level job. If the same instance of the writer is being used in a readonly context it should be allowed.

From the remarks on the type:

/// <remarks>
/// NOTE: The <see cref="ComponentDataFromEntity{T}"/> has the
/// <see cref="NativeDisableContainerSafetyRestrictionAttribute"/> applied meaning that Unity will not issue
/// safety warnings when using it in jobs. This is because there might be many jobs of the same type but
/// representing different <see cref="AbstractTaskDriver"/>s and Unity's safety system gets upset if you straddle
/// across the jobs.
/// </remarks>

This is also required to support the JobPart pattern where parts of jobs are written then then composed into a parent job. If some parts require read access and others write then the safety system throws errors.