Ignore https-proxy-agent dependency in browser environments

[mpint]

High Level Overview of Change

This change ignores https-proxy-agent from browser environments in package.json, mirroring the existing content in https://github.com/XRPLF/xrpl.js/blob/main/packages/xrpl/webpack.config.js#L59

Context of Change

With some effort in our Vite.js based project, we were able to polyfill node dependencies to resolve this known issue.

However, this fix did not extend to our Cypress test environment. With a working Vite configuration, running Cypress tests yields:

Error: Build failed with 2 errors:
node_modules/https-proxy-agent/dist/agent.js:15:38: ERROR: Could not resolve "net"
node_modules/https-proxy-agent/dist/agent.js:16:38: ERROR: Could not resolve "tls"
    at failureErrorWithLog (/node_modules/esbuild/lib/main.js:1566:15)

To get Cypress tests running, we:

1. Utilized @bahmutov/cypress-esbuild-preprocessor to polyfill esbuild node dependencies to match those in our Vite configuration (including aliases)
2. Added "https-proxy-agent": false to xrpl.js package.json's browser field.

This has the effect of ignoring http-proxy-agent in browser environments, which clears up the error and allows Cypress tests to run. See the spec for more information.

Linting changes

This change (adding a boolean value to package.json) triggers this bug in eslint-plugin-import, which motivated the temporary disablement of the import/no-unused-modules linting rule. After the eslint-plugin-import bug is fixed, import/no-unused-modules can be enabled again (e.g. revert this commit and turn back on import/no-unused-modules

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Tests (You added tests for code that already exists, or your new feature included in this PR)
• Documentation Updates
• Release

Before / After

https-proxy-agent is no longer included in browser environments.

[mvadari]

Looks like the linter is failing.

[JST5000]

LGTM

[mvadari]

Please update the changelog