Add additional benchmarks

[dheerajraghunathan]

Currently, we have only four benchmarks: fields, divOperator, linear, and upwind. This PR adds more to the list.

List of benchmarks added/modified: (more todo)

1. divOperator
2. gradOperator
3. laplacianOperator
4. sourceTerm
5. ddtOperator
6. field
7. transportOperator - (combined operator)
8. sparsityPattern

[github-actions]

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[greole]

quick comment make sure that fill and reset are not part of the benchmark section.

[Copilot]

Pull request overview

This PR expands NeoN’s benchmark suite beyond the existing set by adding new benchmark executables for finite-volume operators, linear-algebra components, and a combined DSL “transport operator” expression, plus wiring new benchmark subdirectories into the benchmarks build.

Changes:

• Added new benchmark targets for linear-algebra (linearSystem, solver, sparsityPattern) and several FV cell-centred operators (gradOperator, laplacianOperator, sourceTerm, ddtOperator).
• Updated existing benchmarks (e.g., divOperator, interpolation linear/upwind, and fields/field) to use the shared benchmark main and consistent executor generation.
• Added a new DSL benchmark (transportOperator) but did not yet wire the benchmarks/dsl subdirectory into the top-level benchmarks CMake.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 17 comments.

Show a summary per file

File	Description
benchmarks/CMakeLists.txt	Adds linearAlgebra benchmarks subdir (but currently does not add dsl).
benchmarks/dsl/CMakeLists.txt	Declares the transportOperator benchmark target.
benchmarks/dsl/transportOperator.cpp	Adds combined explicit/implicit transport-expression benchmark.
benchmarks/fields/field.cpp	Reworks field benchmarks to cover internal/boundary fills and copies.
benchmarks/finiteVolume/cellCentred/interpolation/linear.cpp	Updates interpolation benchmark to shared benchmark main + executor generator.
benchmarks/finiteVolume/cellCentred/interpolation/upwind.cpp	Updates interpolation benchmark to shared benchmark main + executor generator.
benchmarks/finiteVolume/cellCentred/operator/CMakeLists.txt	Registers new FV operator benchmark targets.
benchmarks/finiteVolume/cellCentred/operator/ddtOperator.cpp	Adds ddt operator benchmark (explicit + implicit schemes).
benchmarks/finiteVolume/cellCentred/operator/divOperator.cpp	Extends div operator benchmark to template types + explicit/implicit sections.
benchmarks/finiteVolume/cellCentred/operator/gaussGreenGrad.cpp	Removes old benchmark file.
benchmarks/finiteVolume/cellCentred/operator/gradOperator.cpp	Fixes include path + renames/adds explicit grad benchmark.
benchmarks/finiteVolume/cellCentred/operator/laplacianOperator.cpp	Adds laplacian operator benchmark (explicit + implicit).
benchmarks/finiteVolume/cellCentred/operator/sourceTerm.cpp	Adds source term benchmark (explicit + implicit).
benchmarks/linearAlgebra/CMakeLists.txt	Registers new linear-algebra benchmark targets.
benchmarks/linearAlgebra/linearSystem.cpp	Adds linear system construction/reset benchmarks.
benchmarks/linearAlgebra/sparsityPattern.cpp	Adds sparsity pattern construction benchmark.
benchmarks/linearAlgebra/solver.cpp	Adds solver benchmarks (diagonal + optional Ginkgo CG).

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