Reformat webhooks

[avichalp]

Summary

Adds more context to webhooks content by adding hyperlinks for transactions, table ids and chain ids. Fixes GOT-108

Implementation overview

To add links to the tableland docs, and block explorers I have stored these links in the webhooks package against their corresponding chain ids.

• Are changes backward compatible with existing SDKs, or is there a plan to manage it correctly?
• Are changes covered by existing tests, or were new tests included?
• Are code changes optimized for future code readers, commenting on problematic areas to understand (if any)?
• Future-self question: Did you avoid unjustified/unnecessary complexity to achieve the goal?

[linear]

GOT-108 Add webhook handling to event processo

The hook could be defined in the chain config. Just fire at it in a go routine or similar.