Initial support for runtime modules #29104
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Aims to replace https://github.com/matrix-org/matrix-react-sdk-module-api & https://github.com/element-hq/element-web/blob/develop/docs/customisations.md with a run-time alternative which will support similar use-cases and APIs.
Runtime extensions will make it easier to ship & test many variants of Element Web & Desktop and make it easier for consumers to make small tweaks without needing to fork or maintain their own CI/CD pipeline.
The initial implementation of runtime modules aims to replace the deprecated customisations & react-sdk-module-api by offering a way to load those legacy extensions via the new API. This is only temporary and to aid transition as we design the new API surface.
The intent is to provide a very stable API surface, with more being possible using unstable access to globals or by rendering things directly using ReactDOM, this strives to hit a flexible middle ground.
See https://github.com/element-hq/element-modules/tree/main/packages/element-web-module-api#readme