docs: added content for operations in AsyncAPI Document

[BhaswatiRoy]

Fix: #1512

Content:

Meaning of operations
Steps for adding operations
Types of operations
Work: GSoD 2023 Issue

Continuation: #1777

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[TRohit20]

Use backticks wherever required throughout the document.

[derberg]

I like the intro and features a lot, well explained, but for the rest I stopped review as you need to go through it again and make sure it is really about v3, because operations are no longer under channels in v3, these are separate objects in AsyncAPI document, on the same level, on root. And you link them by referencing inside operation what channel it relates to

https://www.asyncapi.com/docs/reference/specification/v3.0.0-next-major-spec.14#operationsObject

onUserSignUp:
  title: User sign up
  summary: Action to sign a user up.
  description: A longer description
  channel:
    $ref: '#/channels/userSignup'

[BhaswatiRoy]

Hello @derberg I have updated the contents as per your technical review, please let me know if you want me to update any thing more.

[BhaswatiRoy]

Thanks @derberg for the re-review, I have updated all the changes as per your comments. Do let me know if I still missed anything and need to add/remove anything.

[TRohit20]

Left couple of suggestions, please update as you see fit.

[BhaswatiRoy]

Left couple of suggestions, please update as you see fit.

Thanks for the review, updated the suggestions!