Restructure chunk_dispatch

[svenklemm]

This patch adjusts the code layout for chunk_dispatch to be similar to the other custom nodes. All the files related to chunk_dispatch are moved into dedicated nodes/chunk_dispatch directory.

[github-actions]

@mkindahl, @jnidzwetzki: please review this pull request.

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[codecov]

Codecov Report

Merging #5169 (a8dfa65) into main (2c70dc6) will increase coverage by 0.09%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             main    #5169      +/-   ##
==========================================
+ Coverage   89.47%   89.56%   +0.09%     
==========================================
  Files         227      225       -2     
  Lines       51615    51535      -80     
==========================================
- Hits        46180    46157      -23     
+ Misses       5435     5378      -57     

Impacted Files	Coverage Δ
src/copy.c	91.76% <ø> (+1.28%)	⬆️
src/nodes/hypertable_modify.c	35.78% <ø> (ø)
src/planner/planner.c	96.04% <ø> (+0.13%)	⬆️
tsl/src/fdw/modify_exec.c	85.55% <ø> (+0.32%)	⬆️
tsl/src/nodes/data_node_copy.c	92.35% <ø> (ø)
tsl/src/nodes/data_node_dispatch.c	93.24% <ø> (ø)
tsl/src/remote/dist_copy.c	88.79% <ø> (ø)
src/nodes/chunk_dispatch/chunk_dispatch.c	94.26% <94.26%> (ø)
src/nodes/chunk_dispatch/chunk_insert_state.c	97.57% <100.00%> (ø)
src/loader/bgw_launcher.c	89.51% <0.00%> (-2.55%)	⬇️
... and 23 more

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