* no-std tests and porting of subxt-metadata
* update pipeline
* fix generate custom metadata test
* fix cargo run command
* adjust pipeline
* remove prelude from subxt-metadata
* revert autoformatting of Cargo.toml
* remove alloc::format! again, still causes linker errors
* add no-std-build for thumbv7em-none-eabi target
* remove std feature flag
* remove libc and add small readme with test instructions
* change ci for nightly no std
Tadeo Hepperle