chore(tinygo): Add -no-debug build flag in examples

[adamreese]

Adding the --no-debug build flag reduces the wasm binary file size
significantly.

For example building examples/http-tinygo before was 764K. Now it's
reduced to 221K.

[lann]

Do we lose good backtraces with this?

[adamreese]

Here is the difference when calling a panic with WASMTIME_BACKTRACE_DETAILS=1

2022-04-22T16:08:02.068361Z ERROR spin_http_engine: Error processing request: wasm trap: wasm `unreachable` instruction executed
wasm backtrace:
    0:  0xe57 - runtime.abort
                    at /opt/homebrew/Cellar/tinygo/0.22.0/src/runtime/runtime_tinygowasm.go:61:6
              - runtime._panic
                    at /opt/homebrew/Cellar/tinygo/0.22.0/src/runtime/panic.go:13:7

2022-04-22T16:08:47.032766Z ERROR spin_http_engine: Error processing request: wasm trap: wasm `unreachable` instruction executed
wasm backtrace:
    0:  0xe43 - <unknown>!runtime._panic

[adamreese]

Doesn't reference anything in user code.

[lann]

Oh right, wasmtime wants WASMTIME_BACKTRACE_DETAILS=1 to inline guest stack traces:

2022-04-22T16:40:42.225817Z ERROR spin_http_engine: Error processing request: wasm trap: wasm `unreachable` instruction executed
wasm backtrace:
    0:  0xe4f - runtime.abort
                    at /usr/lib/tinygo/src/runtime/runtime_tinygowasm.go:61:6
              - runtime._panic
                    at /usr/lib/tinygo/src/runtime/panic.go:13:7
    1: 0x27cec - main.panic_here
                    at /home/lann/f/spin/examples/http-tinygo-outbound-http/main.go:13:7
    2: 0x27c87 - main.init#1$1
                    at /home/lann/f/spin/examples/http-tinygo-outbound-http/main.go:18:13
    3: 0x27859 - spin_http_handle_http_request
                    at /home/lann/f/spin/sdk/go/http/internals.go:34:9
    4: 0x27f4a - __wasm_export_spin_http_handle_http_request
                    at /home/lann/f/spin/sdk/go/http/spin-http.c:113:3

With -no-debug:

2022-04-22T16:41:28.891321Z ERROR spin_http_engine: Error processing request: wasm trap: wasm `unreachable` instruction executed
wasm backtrace:
    0:  0xe3b - <unknown>!runtime._panic
    1: 0x27666 - <unknown>!main.panic_here
    2: 0x27601 - <unknown>!main.init#1$1
    3: 0x271e7 - <unknown>!spin_http_handle_http_request
    4: 0x278be - <unknown>!__wasm_export_spin_http_handle_http_request

Which...really isn't terrible as a default.