feat: Porting host nodes to depthai-nodes

[jkbmrz]

Purpose

Porting over the host nodes with potential for common usage.

Specification

None / not applicable

The following host nodes were ported:

• OverlayFrames (ex DensityMapToFrame),

The following experiments were modified:

• counting/crowdcounting
• generic-example (removing custom host nodes and calling the generic ones from depthai-nodes; This simplifies calling the model in cases where we want to overlay model outputs on top of input images)

Dependencies & Potential Impact

None / not applicable

Updating the generic-example has impact on running it for some models (TODO: modify accordingly in model cards)

Deployment Plan

None / not applicable

Testing & Validation

The changes were tested by running the following experiments both on RVC2 and RVC4:

• depthai-experiments/neural-networks/counting/crowdcounting (OverlayFrames, ApplyColormap)
• generic-example