Make ScatterLines a PointBased plot

[asinghvi17]

Description

I noticed that scatterlines did not have a conversion trait established, so this PR is a quick fix for that.

Type of change

Delete options that do not apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• Added an entry in NEWS.md (for new features and breaking changes)
• Added or changed relevant sections in the documentation
• Added unit tests for new algorithms, conversion methods, etc.
• Added reference image tests for new plotting functions, recipes, visual options, etc.

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt. All benchmark results are based on the mean time and negative percent mean faster than the base branch. Note, that GLMakie + WGLMakie run on an emulated GPU, so the runtime benchmark is much slower. Results are from running:

using_time = @ctime using Backend
# Compile time
create_time = @ctime fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @ctime Makie.colorbuffer(display(fig))
# Runtime
create_time = @benchmark fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @benchmark Makie.colorbuffer(fig)

	using	create	display	create	display
GLMakie	3.50s (3.48, 3.52) 0.01+-	390.64ms (386.62, 399.28) 4.13+-	472.64ms (465.08, 498.96) 11.84+-	7.26ms (7.19, 7.32) 0.05+-	25.43ms (25.33, 25.53) 0.06+-
master	3.46s (3.43, 3.51) 0.03+-	391.48ms (387.01, 394.31) 2.44+-	479.35ms (464.98, 535.81) 25.05+-	7.25ms (7.16, 7.30) 0.06+-	25.46ms (25.35, 25.76) 0.14+-
evaluation	0.99x slower X, 0.04s (1.57d, 0.02p, 0.02std)	1.00x invariant, -0.84ms (-0.25d, 0.65p, 3.29std)	1.01x invariant, -6.71ms (-0.34d, 0.54p, 18.45std)	1.00x invariant, 0.01ms (0.21d, 0.70p, 0.05std)	1.00x invariant, -0.04ms (-0.34d, 0.54p, 0.10std)
CairoMakie	3.16s (3.05, 3.34) 0.10+-	340.19ms (318.27, 386.27) 28.86+-	147.04ms (139.25, 161.11) 9.14+-	7.32ms (7.12, 7.55) 0.16+-	628.71μs (620.46, 637.03) 6.52+-
master	3.10s (3.03, 3.20) 0.07+-	326.09ms (319.01, 345.08) 10.29+-	144.68ms (139.91, 155.61) 5.57+-	7.32ms (7.13, 7.50) 0.12+-	619.36μs (614.85, 623.90) 3.37+-
evaluation	0.98x invariant, 0.07s (0.73d, 0.20p, 0.09std)	0.96x invariant, 14.09ms (0.65d, 0.26p, 19.58std)	0.98x invariant, 2.36ms (0.31d, 0.57p, 7.35std)	1.00x invariant, 0.0ms (0.01d, 0.99p, 0.14std)	0.99x slower X, 9.35μs (1.80d, 0.01p, 4.94std)
WGLMakie	3.78s (3.69, 4.02) 0.11+-	328.56ms (316.45, 369.98) 18.91+-	9.04s (8.75, 9.72) 0.33+-	9.36ms (9.11, 9.62) 0.20+-	71.37ms (67.79, 81.24) 4.64+-
master	3.81s (3.70, 3.97) 0.10+-	334.02ms (315.99, 355.20) 15.38+-	9.09s (8.77, 9.68) 0.29+-	9.44ms (9.07, 10.24) 0.39+-	74.20ms (68.99, 83.58) 5.59+-
evaluation	1.01x invariant, -0.03s (-0.27d, 0.62p, 0.11std)	1.02x invariant, -5.46ms (-0.32d, 0.56p, 17.14std)	1.00x invariant, -0.04s (-0.14d, 0.80p, 0.31std)	1.01x invariant, -0.08ms (-0.25d, 0.65p, 0.29std)	1.04x invariant, -2.83ms (-0.55d, 0.32p, 5.12std)