fix version header in generated files

Merge pull request #40 from pk910/pk910/release-workflow

add release workflow

v1.1.0 release

Merge pull request #32 from pk910/codegen-base

backport `codegen` base code changes

Merge pull request #21 from pk910/support-string-for-byte

Support string for byte

fix workflow caching

add comments

fix panics on concurrent use (concurrent map writes)

fix rounding issue if bitvectors are not a multiple of 8

round up as we can't serialize parial bytes

check offset in dynamic slice unmarshaling