Fix SciMLStyle regressions

[svchb]

Based on #978

Regressions fixed

Indexed assignment LHS splitting

Fixed indexed assignment targets being split even when the full index expression fits on one line.

Before:

cache_table[key,
            slot] = source_table[key, slot] + step * delta_table[key, slot]

After:

cache_table[key, slot] = source_table[key, slot] +
                         step * delta_table[key, slot]

Pair RHS call forced onto a new line
Fixed pair entries where the => RHS call was moved to a new continuation line unnecessarily.

Before:

"Hash table implementation notes" =>
    joinpath("src",
             "hash_table.md")

After:

"Hash table implementation notes" => joinpath("src",
                                              "hash_table.md")

Multiline typed pair vectors collapsed
Fixed multiline typed pair-vector literals being collapsed into a single long line.

Before:

metadata = Pair{String, Any}["Start vertex" => first(graph.vertices), "Final vertex" => last(graph.vertices), "search algorithm" => traversal.algorithm |> typeof |> nameof, "directed" => graph.is_directed]

After:

metadata = Pair{String, Any}["Start vertex" => first(graph.vertices),
                             "Final vertex" => last(graph.vertices),
                             "search algorithm" => traversal.algorithm |> typeof |> nameof,
                             "directed" => graph.is_directed]

Tuple bindings in threaded for headers
Fixed tuple bindings in for headers being split across lines even when they fit.

Before:

@threaded destination.scheduler for (dest_id,
                                     src_id) in zip(eachindex(destination),
                                                    eachindex(source))

After:

@threaded destination.scheduler for (dest_id, src_id) in zip(eachindex(destination),
                                                             eachindex(source))

Multiline do block arguments
Fixed calls with keyword arguments followed by do blocks where the closing parenthesis was moved to its own line and do arguments were realigned incorrectly.

Before:

foreach_neighbor(points, points, index;
                 backend=SerialBackend()
                 ) do item, neighbor,
                      _, _

After:

foreach_neighbor(points, points, index;
                 backend=SerialBackend()) do item, neighbor,
                                             _, _

Dict entries with tuple RHS values
Fixed Dict(...) entries with tuple RHS values so pair arrows align consistently and RHS tuple contents remain in SciML-style layout.

Before:

algorithm_cases = Dict(
    "default search" => (),
    "with static scheduler" =>
        (backend=StaticBackend(),),
    "with damping source term" =>
        (source_terms=DampingTerm(coefficient=1e-4),),
)

After:

algorithm_cases = Dict(
    "default search"           => (),
    "with static scheduler"    => (backend=StaticBackend(),),
    "with damping source term" => (source_terms=DampingTerm(coefficient=1e-4),),
)

Comments inside multiline tuple RHS values
Fixed comments inside multiline tuple RHS values being shifted left after formatting.

Before:

"with weighted viscosity" => (
 # from 0.02*10.0*1.2*0.05/8
                              viscosity_model=WeightedViscosity(nu=0.0015),)

After:

"with weighted viscosity" => (
                                # from 0.02*10.0*1.2*0.05/8
                                viscosity_model=WeightedViscosity(nu=0.0015),)

Short binary expressions inside tuple RHS values
Fixed short RHS expressions staying split even though the flattened expression fits within the SciML margin.

Before:

"with spline kernel" => (smoothing_length=1.1 *
                                           item_spacing,
                         smoothing_kernel=SplineKernel{2}())

After:

"with spline kernel" => (smoothing_length=1.1 * item_spacing,
                         smoothing_kernel=SplineKernel{2}())

[penelopeysm]

This is a nice combo of changes -- but would it be possible to have separate PRs for each fix individually?

[svchb]

split into multiple prs #997, #998, #999, #1000, #1001