fix(cargo.toml): rm debug symbols in release build

[kskarthik]

Helps further slimming of the binary.

Info:

1. https://doc.rust-lang.org/cargo/reference/profiles.html#strip
2. https://github.com/johnthagen/min-sized-rust#optimize-for-size

What kind of change does this PR introduce?

• Feature

Did this PR introduce a breaking change?

• No

[last-partizan]

Looks good to me

[LoipesMas]

I think we'd rather optimize for speed, not size.
And from my testing it looks like the difference is negligible anyway:

That's current profile, with strip = true added and with strip = true and opt-level = "z" added, respectively.
It's a 4mb difference at most, so I'm not sure if potential performance loss is worth it.
Maybe if we did a benchmark and there were no performance loss.

[kskarthik]

@LoipesMas so strip=true should be good to go, if performace is the choice

[LoipesMas]

Yeah, just stripping should be fine.