Implement new Index Column (#4827)

* Implement new Index Column

* Correct slicing of blobs

* Mark coding blobs as coding when they're recovered

* Prevent broadcast stages from mixing coding and data blobs in blocktree

* Mark recovered blobs as present in the index

* Fix indexing error in recovery

* Fix broken tests, and some bug fixes

* increase min stack size for coverage runs

scripts/coverage.sh

@@ -27,6 +27,7 @@ coverageFlags+=("-Coverflow-checks=off") # Disable overflow checks, which create
 export RUSTFLAGS="${coverageFlags[*]}"
 export CARGO_INCREMENTAL=0
 export RUST_BACKTRACE=1
+export RUST_MIN_STACK=8388608
 
 echo "--- remove old coverage results"
 if [[ -d target/cov ]]; then