Bring this package up to date to use with the new noir/nargo

[LogvinovLeon]

Currently - it's impossible to use this package as a dependency because of a couple reasons:

• nargo disallows hyphens in package names:
  https://github.com/noir-lang/noir/blob/4467ea9e285ec810f45052e469ac2c1f9903a7d3/compiler/noirc_frontend/src/graph/mod.rs#L109

[tooling/nargo_toml/src/lib.rs:130] name.parse() = Err(
    "Package names must be non-empty and cannot contain hyphens",
)
Invalid package name `noir-u2b` found in /Users/leonidlogvinov/nargo/github.com/colinnielsen/noir-u2bv0.3.0/Nargo.toml

• There is no package type specified
• All functions are private
• Library crates should have lib.nr instead of main.nr
• Compiler version is fixed to 0.8.0

This PR fixes that and makes it possible to import this lib into modern projects

[LogvinovLeon]

@colinnielsen Please let me know if there is anything blocking this PR from merging

[colinnielsen]

@colinnielsen Please let me know if there is anything blocking this PR from merging

looks great - thanks!

[colinnielsen]

@colinnielsen Please let me know if there is anything blocking this PR from merging

actually - looks like CI is failing, do you mind bumping the version in CI?

[LogvinovLeon]

I can't run CI on this PR, but it passes now in my fork

[colinnielsen]

I can't run CI on this PR, but it passes now in my fork

passes! merging now, thanks