Add wasi directives for tinygo

[alexkashintsev-tomtom]

Goal
Adding WASI directives to be able to compile with tinygo (and use it with WASM for Envoy).

Without these directives for compiler, compiling with tinygo v0.28.1 on Darwin fails with:

tinygo build -o main.wasm -scheduler=none -target=wasi main.go
# golang.org/x/sys/unix
../../go/pkg/mod/golang.org/x/sys@v0.10.0/unix/syscall_linux.go:1901:64: undefined: syscall.Rlimit
../../go/pkg/mod/golang.org/x/sys@v0.10.0/unix/syscall_linux.go:1906:50: undefined: syscall.Rlimit
../../go/pkg/mod/golang.org/x/sys@v0.10.0/unix/syscall_linux.go:1906:79: undefined: syscall.Rlimit
../../go/pkg/mod/golang.org/x/sys@v0.10.0/unix/syscall_unix.go:595:17: undefined: syscall.Setrlimit
../../go/pkg/mod/golang.org/x/sys@v0.10.0/unix/syscall_unix.go:595:47: undefined: syscall.Rlimit

[alexkashintsev-tomtom]

Sorry for spam, after double-checking we indeed need this directives to use maxmind with Tinygo.

[oschwald]

Thanks!