releases/mcap-cli/v0.0.36

Include metadata in mcap merge (#958)

Includes metadata records from input files in mcap merge via a new read
option. This required a breaking change to read options to avoid a
dependency cycle: since I need to supply a callback option to apply to
metadata records, the readopts package required awareness of "mcap"
while "mcap" required awareness of readopts for configuration.

To address this I have moved readopts.go under the mcap package. Users
who upgrade the library will need to swap out the package name if they
are using any options.