Rename the derive macro helper attribute builder to prop

[alexisfontaine]

Closes #497

[codecov]

Codecov Report

Base: 64.65% // Head: 64.65% // No change to project coverage 👍

Coverage data is based on head (6cf0698) compared to base (8870559).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #504   +/-   ##
=======================================
  Coverage   64.65%   64.65%           
=======================================
  Files          52       52           
  Lines        8525     8525           
=======================================
  Hits         5512     5512           
  Misses       3013     3013           

Impacted Files	Coverage Δ
docs/src/main.rs	0.45% <0.00%> (ø)
packages/sycamore-macro/src/lib.rs	86.20% <ø> (ø)
packages/sycamore-router/src/router.rs	27.88% <ø> (ø)
packages/sycamore/src/suspense.rs	94.57% <ø> (ø)
website/src/content.rs	0.00% <ø> (ø)
packages/sycamore-macro/src/props.rs	72.09% <50.00%> (ø)
packages/sycamore-macro/src/component/mod.rs	96.42% <100.00%> (ø)

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[lukechu10]

Awesome!