Create new logviewer UI components

[sanand0]

@nehak0601 could you please

• [x] Review the logviewer code
• [x] Fork this repo, create a new branch, share a pull request into master
• [ ] @sanand0 will review, revise and merge

Create a series of components in logviewer/components.js that can be triggered as follows:

<div class="sidebar">
  <div class="card-load-time"></div>
  <div class="card-errors"></div>
</div>
<script src="logviewer/components.js"></script>

render_logviewer_component('.card-load-time', {
  // configuration
})
render_logviewer_component('.card-errors', {
  // configuration
})

[sanand0]

Status: @nehak0601 will share a base pull request by Tue 22 Sep 2 pm IST.

[sanand0]

@nehak0601 is working on this at https://github.com/gramener/gramex/pull/296 and will send 10 components by 2:30 pm IST on Thu 24 Sep for review.

[sanand0]

This has slipped, and we're no longer planning a specific release for this feature.