feat: PGSql MTLS support

[AnaghHegde]

Description

Mutual TLS, or mTLS for short, is a method for mutual authentication. mTLS ensures that the parties at each end of a network connection are who they claim to be by verifying that they both have the correct private key.
This PR adds support for mTLS for postgres datasource. Unlike the standard way of storing the certs in disk, we store them in the database. This has been achieved via the custom implementation of SSL Factory. The postgres driver support passing the custom ssl factory while creating connection, which then will be used for handling and establishing the connection.

PR fixes following issue(s)

Fixes #31326

Type of change

• New feature (non-breaking change which adds functionality)

Testing

How Has This Been Tested?

• Manual

Test Plan

Add Testsmith test cases links that relate to this PR

Issues raised during DP testing

Link issues raised during DP testing for better visiblity and tracking (copy link from comments dropped on this PR)

Checklist:

Dev activity

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• PR is being merged under a feature flag

QA activity:

• Speedbreak features have been covered
• Test plan covers all impacted features and areas of interest
• Test plan has been peer reviewed by project stakeholders and other QA members
• Manually tested functionality on DP
• We had an implementation alignment call with stakeholders post QA Round 2
• Cypress test cases have been added and approved by SDET/manual QA
• Added Test Plan Approved label after Cypress tests were reviewed
• Added Test Plan Approved label after JUnit tests were reviewed

Summary by CodeRabbit

• New Features
  • Enhanced the Postgres plugin to support SSL certificate validation for secure database connections. Users can now select between VERIFY_CA and VERIFY_FULL modes for SSL verification, ensuring a higher level of security for database communications.

[coderabbitai]

Walkthrough

The update introduces SSL certificate validation for the Postgres plugin, enhancing security by verifying server certificates against known CAs. It adds two verification levels, VERIFY_CA and VERIFY_FULL, to the connection setup process. Additionally, a new class, StringCertValidatingFactory, is created to manage the conversion of certificates and keys, setup of keystores and truststores, and initialization of SSLContext for secure database connections.

Changes

File Path	Change Summary
.../postgresPlugin/src/main/java/com/external/plugins/PostgresPlugin.java	Added VERIFY_CA and VERIFY_FULL cases in createConnectionPool for SSL certificate validation.
.../postgresPlugin/src/main/java/com/external/plugins/utils/StringCertValidatingFactory.java	Introduced to handle certificate conversion, keystore and truststore setup, and SSLContext initialization.

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[github-actions]

Failed server tests

• com.appsmith.server.solutions.ShareWorkspacePermissionTests#testAdminInviteRoles

[AnaghHegde]

/build-deploy-preview

[github-actions]

Deploying Your Preview: https://github.com/appsmithorg/appsmith/actions/runs/7914129925.
Workflow: On demand build Docker image and deploy preview.
skip-tests: . env: .
PR: 31067.
recreate: .

[github-actions]

Deploy-Preview-URL: https://ce-31067.dp.appsmith.com

[github-actions]

This PR has not seen activitiy for a while. It will be closed in 7 days unless further activity is detected.

[github-actions]

Failed server tests

• com.appsmith.server.services.LayoutServiceTest#createLayoutWithInvalidPageID