Adds Shiny error tracking (#116)

[arunkodati77]

Closes #116

Changes description

There are two implementations for this issue
1) Supports Newer versions of shiny(>=1.8.1):

   -  uses `unhandledError()` from latest version of shiny (1.8.1) to log error message (global error handler). 

This unhandledError() will be triggered when an error occurred and before the session end and contains the error object (Making it suitable for logging root cause of the error).

2) Supports older versions of shiny(<1.8.1):

   - Uses shiny javascript event i.e `shiny:error`, This js function will also get triggered after error and before session end, However it only captures Javascript/UI Errors in output elements.

Examples:
a) Able to log errors: Will log 'Object x not found error'

        output$plot1 <- renderPlot({
             x/y
            })

b) Unable to log: Not able to log before app stops running

            observe({
            x/y 
           })

Note1: We also added public method log_error(output_id, message). Such that user can use this method log errors from their 'try-catch' block.

Note2: (Will add this after discussion) In Older versions, we can also capture other errors in shiny reactive elements, By using , options(shiny.error = function(){.....})
The only drawback is, we won't get the error object to identify the root cause of the issue.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 29.92%. Comparing base (bfbce9c) to head (ce33809).

❗ Current head ce33809 differs from pull request most recent head 2040b7d. Consider uploading reports for the commit 2040b7d to get more accurate results

Files	Patch %	Lines
R/telemetry.R	0.00%	18 Missing ⚠️
R/ui_elements.R	0.00%	12 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
- Coverage   30.48%   29.92%   -0.57%     
==========================================
  Files          16       16              
  Lines        1476     1504      +28     
==========================================
  Hits          450      450              
- Misses       1026     1054      +28     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[averissimo]

The code looks good. Can you detail some examples apps to test it?

Mainly, a way to test it to see limitations before v1.8.1

[averissimo]

Should also have an assertion checkmate::assert_flag(track_errors)

[arunkodati77]

Done

[averissimo]

Please consider adding here a description that there is a limitation on the errors' information on versions before shiny 1.8.1.

[arunkodati77]

The code looks good. Can you detail some examples apps to test it?

Mainly, a way to test it to see limitations before v1.8.1

Added in the PR Description