feat: Add Amazon DynamoDB database support (#389)

* feat: add Amazon DynamoDB database support

Implements a new DynamoDB driver plugin with PartiQL query support,
AWS IAM/Profile/SSO authentication, GSI/LSI browsing, table scanning
with cursor-based pagination, capacity/metrics display, DynamoDB Local
support, and cell editing via PartiQL INSERT/UPDATE/DELETE generation.

* fix: address PR review feedback for DynamoDB support

* feat: store plugin secure fields in Keychain, add DynamoDB tests

* fix: address second round of PR review feedback

* fix: throw on invalid base64, default unknown filter ops to false

* fix: address third round of PR review feedback

Author: datlechin

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Reusable SSH tunnel profiles: save SSH configurations once and select them across multiple connections
 - Ctrl+HJKL navigation as arrow key alternative for keyboards without dedicated arrow keys
+- Amazon DynamoDB database support with PartiQL queries, AWS IAM/Profile/SSO authentication, GSI/LSI browsing, table scanning, capacity display, and DynamoDB Local support
 
 ### Fixed