fix: ignore invalid python tags

Signed-off-by: Frost Ming <me@frostming.com>

fix: lowercase the arch

Signed-off-by: Frost Ming <me@frostming.com>

feat: implementation capitalized name

Signed-off-by: Frost Ming <me@frostming.com>

fix: platform parsing missing arch part

Signed-off-by: Frost Ming <me@frostming.com>

fix: macos platform tags

Signed-off-by: Frost Ming <me@frostming.com>

fix: better typing

Signed-off-by: Frost Ming <me@frostming.com>

feat: markers for env spec

Signed-off-by: Frost Ming <me@frostming.com>

fix: add normalized representation for platform

Signed-off-by: Frost Ming <me@frostming.com>

feat: use the same marker environment for current platform

Signed-off-by: Frost Ming <me@frostming.com>

fix: align the argument name with packaging

Signed-off-by: Frost Ming <me@frostming.com>