tinygo support

[rsteube]

Support tinygo for minimal sized standalone completers and carapace-spec.

• build with tinygo build -no-debug -panic=trap -gc=leaking (Optimizing binaries)
• strip binary
• compress with upx -9
• reduce carapace-pflag to Bool, BoolSlice, Count, String and StringSlice
• also avoid large imports like fmt if possible (and if actually makes sense)
• detach from cobra using a minified fork as alternative import

[rsteube]

needs https://github.com/tinygo-org/tinygo/issues/632 needs https://github.com/tinygo-org/tinygo/issues/2950