chore: migrate to esm

[kamilmysliwiec]

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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
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• Other... Please describe:

What is the current behavior?

Issue Number: N/A

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Does this PR introduce a breaking change?

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Other information

[Alchez]

@kamilmysliwiec can this PR be merged or atleast receive an alpha release in tandem with nestjs/nest#16391 (comment)?

I'm seeing the following trace with the latest version of this package, but the changes in this PR can solve this issue:

> ts-node ./node_modules/typeorm/cli migration:run -d dist/libs/common/src/config/database.config.js

Error during migration run:
Error: Cannot find module '/node_modules/.pnpm/@nestjs+swagger@11.4.2_@nestjs+common@12.0.0-alpha.4_class-transformer@0.5.1_class-vali_328be75e19f9d8897677c1bedae7bfac/node_modules/@nestjs/common/interfaces.js'
    at CommandUtils.loadDataSource (/node_modules/.pnpm/typeorm@0.3.29_ioredis@5.10.1_pg@8.20.0_ts-node@10.9.2_@swc+core@1.15.33_@types+node@25.7.0_typescript@5.9.3_/node_modules/src/commands/CommandUtils.ts:21:19)
    at async Object.handler (/node_modules/.pnpm/typeorm@0.3.29_ioredis@5.10.1_pg@8.20.0_ts-node@10.9.2_@swc+core@1.15.33_@types+node@25.7.0_typescript@5.9.3_/node_modules/src/commands/MigrationRunCommand.ts:42:26)

[kamilmysliwiec]

@Alchez i will - as soon as it's ready to be published