Migrate to once_cell

[futursolo]

Description

once_cell has been accepted into the std. Migrating to once_cell would help us to eventually move to the std version.

rust-lang/rust#74465

This pull request migrates all lazy_static usage to once_cell.

Checklist

• I have reviewed my own code
• I have added tests

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[github-actions]

Size Comparison

Details

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
boids	172.593	172.582	-0.011	-0.006%
contexts	109.620	109.624	+0.004	+0.004%
counter	86.550	86.551	+0.001	+0.001%
counter_functional	87.203	87.201	-0.002	-0.002%
dyn_create_destroy_apps	89.664	89.664	0	0.000%
file_upload	102.626	102.626	0	0.000%
function_memory_game	166.894	166.895	+0.001	+0.001%
function_router	351.666	352.024	+0.358	+0.102%
function_todomvc	161.561	161.558	-0.003	-0.002%
futures	226.233	226.235	+0.002	+0.001%
game_of_life	107.189	107.187	-0.003	-0.003%
inner_html	83.618	83.618	0	0.000%
js_callback	112.846	112.854	+0.009	+0.008%
keyed_list	195.105	195.107	+0.002	+0.001%
mount_point	86.180	86.181	+0.001	+0.001%
nested_list	115.688	115.688	-0.001	-0.001%
node_refs	93.597	93.599	+0.002	+0.002%
password_strength	1538.157	1538.156	-0.001	-0.000%
portals	97.225	97.224	-0.001	-0.001%
router	320.458	320.810	+0.352	+0.110%
simple_ssr	154.493	154.492	-0.001	-0.001%
ssr_router	398.062	398.411	+0.349	+0.088%
suspense	110.544	110.538	-0.006	-0.005%
timer	89.258	89.261	+0.003	+0.003%
todomvc	142.615	142.617	+0.002	+0.001%
two_apps	87.160	87.161	+0.001	+0.001%
web_worker_fib	153.406	153.408	+0.002	+0.001%
webgl	87.438	87.438	0	0.000%

✅ None of the examples has changed their size significantly.

[ranile]

once_cell has been accepted into the std. Migrating to once_cell would help us to eventually move to the std version.

If they have the same API, #2743 can also use std once_cell on nightly.

[futursolo]

If they have the same API, #2743 can also use std once_cell on nightly.

once_cell has just changed from std::lazy to std::sync / std::cell last week.
I think we should wait until the naming / location to settle before migrating to std.