fix(knobs): separate contexts to avoid useless updates

[layershifter]

Extracted #2207.

Background

Previously appendLog(), clearLog() and items[] for logging knobs where stored in one React Context and this creates useless updates for useLogKnob() as it receives notifications about items[] updates and this produces unwanted renders of component's examples.

[DustyTheBot]

	Warnings
⚠️	There are no updates provided to CHANGELOG. Ensure there are no publicly visible changes introduced by this PR.

Perf comparison

Status	Scenario	Fluent TPI	Fabric TPI	Ratio	Iterations	Ticks
🔧	Avatar.Fluent	0.61	0.4	1.53:1	2000	1218
🔧	Button.Fluent	1.33	0.18	7.39:1	1000	1334
🔧	Checkbox.Fluent	1.34	0.29	4.62:1	1000	1339
🔧	Dialog.Fluent	0.34	0.17	2:1	5000	1723
🔧	Dropdown.Fluent	3.6	0.36	10:1	1000	3602
🔧	Icon.Fluent	0.24	0.03	8:1	5000	1183
🔧	Image.Fluent	0.1	0.08	1.25:1	5000	496
🔧	Slider.Fluent	1.91	0.28	6.82:1	1000	1905
🔧	Text.Fluent	0.05	0.02	2.5:1	5000	258
🦄	Tooltip.Fluent	0.42	18.42	0.02:1	5000	2106

🔧 Needs work     🎯 On target     🦄 Amazing

Perf tests with no regressions

Scenario	Current PR Ticks	Baseline Ticks	Ratio
ListMinimalPerf.default	999	716	1.4:1
AnimationMinimalPerf.default	655	536	1.22:1
TextMinimalPerf.default	279	236	1.18:1
AttachmentSlotsPerf.default	4173	3703	1.13:1
ListCommonPerf.default	1306	1153	1.13:1
ToolbarMinimalPerf.default	883	780	1.13:1
DialogMinimalPerf.default	1903	1693	1.12:1
ButtonMinimalPerf.default	1432	1288	1.11:1
ProviderMinimalPerf.default	626	567	1.1:1
TableMinimalPerf.default	589	542	1.09:1
PortalMinimalPerf.default	266	246	1.08:1
Tooltip.Fluent	2106	1946	1.08:1
TextAreaMinimalPerf.default	3098	2886	1.07:1
Dialog.Fluent	1723	1617	1.07:1
Dropdown.Fluent	3602	3411	1.06:1
DropdownMinimalPerf.default	3749	3577	1.05:1
GridMinimalPerf.default	947	899	1.05:1
HeaderMinimalPerf.default	433	414	1.05:1
ImageMinimalPerf.default	522	498	1.05:1
InputMinimalPerf.default	1082	1033	1.05:1
TreeMinimalPerf.default	972	927	1.05:1
DropdownManyItemsPerf.default	482	470	1.03:1
MenuButtonMinimalPerf.default	1630	1583	1.03:1
DividerMinimalPerf.default	898	878	1.02:1
HeaderSlotsPerf.default	1294	1278	1.01:1
CheckboxMinimalPerf.default	7142	7174	1:1
Icon.Fluent	1183	1185	1:1
Slider.Fluent	1905	1898	1:1
AlertMinimalPerf.default	641	646	0.99:1
AttachmentMinimalPerf.default	1074	1084	0.99:1
AvatarMinimalPerf.default	796	802	0.99:1
ButtonSlotsPerf.default	1766	1790	0.99:1
CarouselMinimalPerf.default	2151	2177	0.99:1
ChatDuplicateMessagesPerf.default	599	605	0.99:1
RefMinimalPerf.default	157	159	0.99:1
SegmentMinimalPerf.default	1251	1264	0.99:1
SliderMinimalPerf.default	1905	1923	0.99:1
SplitButtonMinimalPerf.default	12497	12643	0.99:1
TooltipMinimalPerf.default	2441	2463	0.99:1
ItemLayoutMinimalPerf.default	1685	1713	0.98:1
Text.Fluent	258	262	0.98:1
StatusMinimalPerf.default	839	869	0.97:1
VideoMinimalPerf.default	799	827	0.97:1
Avatar.Fluent	1218	1253	0.97:1
Button.Fluent	1334	1379	0.97:1
AccordionMinimalPerf.default	240	250	0.96:1
LayoutMinimalPerf.default	580	607	0.96:1
MenuMinimalPerf.default	2298	2384	0.96:1
RadioGroupMinimalPerf.default	371	388	0.96:1
Image.Fluent	496	514	0.96:1
ChatMinimalPerf.default	1719	1811	0.95:1
EmbedMinimalPerf.default	6561	6931	0.95:1
ChatWithPopoverPerf.default	641	680	0.94:1
IconMinimalPerf.default	1006	1069	0.94:1
LoaderMinimalPerf.default	2785	2963	0.94:1
ProviderMergeThemesPerf.default	1114	1180	0.94:1
ReactionMinimalPerf.default	2521	2677	0.94:1
PopupMinimalPerf.default	367	394	0.93:1
BoxMinimalPerf.default	267	290	0.92:1
Checkbox.Fluent	1339	1460	0.92:1
LabelMinimalPerf.default	1859	2033	0.91:1
FlexMinimalPerf.default	360	398	0.9:1
CustomToolbarPrototype.default	4241	4710	0.9:1
HierarchicalTreeMinimalPerf.default	800	899	0.89:1
FormMinimalPerf.default	769	869	0.88:1

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