chore: add package.cargo-near.debug = true to release profile

[dj8yfo]

it was noticed that default suggestions to enable backtrace only produce confusion, as backtrace info
without source code is more confusing than helpful:

current (in main) RUST_BACKTRACE=1 cargo near build

current (in main) RUST_BACKTRACE=full cargo near build

---

from this pr RUST_BACKTRACE=1 cargo near build

from this pr RUST_BACKTRACE=full cargo near build

this beefs up the binary size twice, doing a plain debug = true for release profile results in 250 MB binary

# installed with
# cargo install --locked --path cargo-near
❯ du -sk $(which cargo-near)
28984   /home/jerrick/.cargo/bin/cargo-near

# installed with (`package.cargo-near.debug = true`)
# cargo install --locked --path cargo-near
❯ du -sk $(which cargo-near)
51236   /home/jerrick/.cargo/bin/cargo-near

---

alternative to this is #196

[dj8yfo]

@race-of-sloths include

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[frol]

See #196 (review)