Revamp error handling and improve Sentry integration

[tx-nikola]

Set up Sentry in order to log messages

Setup the Sentry organization and project

• For the project environment, choose “Vue”

• Find and copy the Sentry DSN url in this format: “https://<first_number>@<second_number>.ingest.de.sentry.io/<id>” - just a whole DSN url

• Set up the env variables:

  • SENTRY_DSN # The DSN url mentioned above
  • SENTRY_ENV # The environment so we can filter the issues easily -> “localhost” | “production” | “development”

• Then we can get the logged issues from the app

• We choose the issue in the “Issues” tab

  • Here we have the information that Sentry picks up
    • For making it easier to resolve issues, for custom handled errors, we also log some of the data related to the errors, such as: error, parentFunctionName, parentFunctionParams, accountAddress, filePath - in order to find and understand the issue easily (eg. if the params were wrong, which function threw the error, etc.)
  • This information can be found in the ReferenceError section of the Issue on the sentry platform

• If we deem some errors not important, and want to limit the number of raised issues (pricing, clutter, etc.) we can additionally ignore them in the config like this:

ignoreErrors: [
  "Network error. Check your internet connection and try again.",
  "Network Error",
  "Invalid network",
  "Incorrect wallet network selected",
  "transfer amount exceeds allowance",
],

and those errors wouldn’t be logged on the platform.

This PR fixes #217

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[popzxc]

Set up before merging

Can't we implement it in an additive form, e.g. sentry is only initialized if corresponding env variables are set?
I'm not sure if every project that uses the portal will set up Sentry (at least, right away).

[tx-nikola]

@popzxc
Added the changes to omit initializing Sentry SDK if the DSN is not defined in the .env variables.
Also added a small section in the README.md for Sentry.