Text HTML refactor

[ParsaGachkar]

• [x] Add EditForm to TextHtmlEditPlugin.razor
• [x] Fix double call on TextHtmlEditPlugin's Initialization

[ParsaGachkar]

@pournasserian there are multiple solutions to avoid double call for OnInitialized

• First one i noticed at Microsoft's doc is to cache the data in our client service Stateful reconnection after prerendering so it prevents second Api call at client level but duplicate code execution still remains.
• We can always disable prerendering this is a feasible solution for admin panel as we don't really need prerendering at admin panel almost all CSR frameworks Angular, React, Vue don't have SSR enabled and yet they work perfectly fine as private access Admin Panels that don't need SSR. but it's not good for Crawler Bots and SEO so our Public Pages absolutely need SSR.
• Another solution is to check whether the response header has been sent to the client. if it's not, server is still prerendering else it's running at browser IHttpContextAccessor.HttpContext.Response.HasStarted. as you can see this is more like a hack than a proper solution. check the comments on the solution some people believe that this is not a good solution and there is not guaranty that this will not be changed in future. some suggest just using OnAfterRender(bool isFirstRender) and ignore OnInitialized as it is guaranteed by the signature.

[pournasserian]

@ParsaGachkar please implement based on the third solution. Then we will review that.

[ParsaGachkar]

@pournasserian there is a problem after removing the second call by checking IHttpContextAccessor.HttpContext.Response.HasStarted all values that were being set in OnInitialized were null! so, i took a hybrid approach of solutions 1 and 3!

• add an OnPreRendering method definition to avoid duplicate call of our db logic
• cache values after OnPreRendering
• restore values from cache at client-side OnInitialized call
• define an attribute MemoryCachedValueAttribute to ease the process (avoid storing and restoring all properties of Component)