[FC-0118] XblockView/XblockCreateView Standardization

[taimoor-ahmed-1]

PR: #38723

• 0025 – Standardize Serializer Usage — @taimoor-ahmed-1
• 0026 – Standardize Permission Classes — @taimoor-ahmed-1
• 0027 – Standardize API Documentation & Schema Coverage — @Abdul-Muqadim-Arbisoft
• 0028 – Standardize RESTful API Endpoints using DRF ViewSets — @Faraz32123
• 0029 – Standardize Error Responses — @taimoor-ahmed-1
• 0034 – Unify Auth (OAuth2 v2) — @Faraz32123
• 0035 – Port Legacy Django Views to DRF — @Faraz32123
• 0036 – Normalize Deeply Nested JSON APIs — @taimoor-ahmed-1
• 0037 – API Versioning Strategy — @taimoor-ahmed-1
• 0038 - Introduce Row level Security Layer - @Abdul-Muqadim-Arbisoft
• 0040 – Document & Consolidate Internal APIs used by MFEs — @Abdul-Muqadim-Arbisoft