Add ExplicitEntryOracle to block encode a matrix
#1166
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This bloq enables us to block encode a square matrix given its entries as a classical
NDArray, when used with theSparseMatrixblock encoding and theFullRowColumnOracle.Caveats: this is mostly for prototyping and testing, as real algorithms should compute their entries more efficiently. Under the hood, this bloq depends on QROM and quantum variable rotations to a rather high degree of precision.