docs: add ADR-005 regarding build process for Thermidor

[louis-bompart]

Ink down a new architectural decision record (ADR-005) documenting the build process for the @coveo/thermidor package. The ADR formalizes the decision to distribute Thermidor as an ESM-only package, outlines the rationale behind this choice, and details the implications for consumers and contributors.

https://coveord.atlassian.net/browse/KIT-5850

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Pull request overview

Adds a new Thermidor architectural decision record (ADR-005) documenting the package’s build/distribution approach, focusing on an ESM-only output and the implications for consumers (especially Node.js CJS require() users).

Changes:

• Documented the decision to publish @coveo/thermidor as ESM-only and compile via tsc into dist/.
• Captured tradeoffs vs dual ESM/CJS packaging (incl. dual-package hazard) and outlined migration/compatibility constraints.
• Defined runtime/operational implications and rollout guidance for consumers.

[pkg-pr-new]

• @coveo/pkg-new-template

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commit: 3b3f5fa