Add MathML support + test.

[jonas-scholz123]

Description

MathML tags now are assigned the correct namespace, so that the browser can correctly render them. We follow the same procedure already used for SVGs that require a non-default namespace also.

• Added a unit test to ensure the namespace is correctly applied to child tags.
• Tested locally (firefox, safari, chrome) that MathML is now correctly rendered.

Fixes #3120

Checklist

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

[github-actions]

Visit the preview URL for this PR (updated for commit 18d34fb):

https://yew-rs-api--pr3121-feature-mathml-0kgifs6v.web.app

_{(expires Fri, 17 Feb 2023 18:04:53 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

[github-actions]

Size Comparison

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
async_clock	108.033	108.301	+0.268	+0.248%
boids	170.914	171.173	+0.259	+0.151%
communication_child_to_parent	90.991	91.246	+0.255	+0.280%
communication_grandchild_with_grandparent	105.319	105.574	+0.255	+0.242%
communication_grandparent_to_grandchild	101.161	101.416	+0.255	+0.252%
communication_parent_to_child	88.083	88.338	+0.255	+0.289%
contexts	107.861	108.116	+0.255	+0.236%
counter	85.889	86.156	+0.268	+0.312%
counter_functional	86.199	86.467	+0.268	+0.310%
dyn_create_destroy_apps	88.695	88.963	+0.268	+0.302%
file_upload	100.412	100.680	+0.268	+0.266%
function_memory_game	165.034	165.293	+0.259	+0.157%
function_router	349.671	349.927	+0.256	+0.073%
function_todomvc	160.019	160.277	+0.259	+0.162%
futures	224.653	224.921	+0.268	+0.119%
game_of_life	106.642	106.909	+0.268	+0.251%
immutable	182.111	182.535	+0.424	+0.233%
inner_html	82.281	82.549	+0.268	+0.325%
js_callback	112.161	112.416	+0.255	+0.227%
keyed_list	196.353	196.607	+0.255	+0.130%
mount_point	85.517	85.784	+0.268	+0.313%
nested_list	113.545	113.800	+0.255	+0.224%
node_refs	93.531	93.786	+0.255	+0.273%
password_strength	1548.865	1549.112	+0.247	+0.016%
portals	96.720	96.975	+0.255	+0.264%
router	319.878	320.133	+0.255	+0.080%
simple_ssr	151.188	151.447	+0.259	+0.171%
ssr_router	394.967	395.226	+0.259	+0.066%
suspense	109.284	109.539	+0.255	+0.233%
timer	88.767	89.034	+0.268	+0.301%
todomvc	141.249	141.508	+0.259	+0.183%
two_apps	86.509	86.776	+0.268	+0.309%
web_worker_fib	152.060	152.327	+0.268	+0.176%
webgl	85.071	85.339	+0.268	+0.315%

✅ None of the examples has changed their size significantly.

[github-actions]

Benchmark - SSR

Yew Master

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	371.912	372.501	372.050	0.183
Hello World	10	696.468	704.116	699.221	1.951
Function Router	10	2299.803	2333.117	2312.766	9.120
Concurrent Task	10	1007.960	1008.822	1008.318	0.272

Pull Request

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	376.717	377.084	376.846	0.125
Hello World	10	697.086	708.182	701.585	3.170
Function Router	10	2340.142	2362.984	2349.594	9.351
Concurrent Task	10	1007.709	1008.916	1008.409	0.328

[futursolo]

Thank you for the pull request!

[Jaffa-Cakes]

Looks good to me.

[hamza1311]

Thanks for the PR!