fix: reject negative logarithm inputs

[puneetdixit200]

Which issue does this PR close?

• Closes PostgreSQL compatibility: ln(-1.0::float8) should error, not return NaN #22271.

Rationale for this change

PostgreSQL-compatible logarithm behavior should reject negative inputs instead of returning NaN. DataFusion already keeps the existing zero/base-one edge cases, so this change is scoped to negative logarithm arguments.

What changes are included in this PR?

• Adds a positive-domain check for ln, log2, and log10.
• Adds the same negative-value check to log(...) for float and decimal inputs.
• Updates scalar sqllogictests and log unit tests to cover the new error behavior while keeping existing zero/base behavior unchanged.

Are these changes tested?

• cargo fmt --all
• cargo test -p datafusion-functions log --lib
• cargo test --profile=ci --test sqllogictests -- scalar.slt
• cargo clippy --all-targets --all-features -- -D warnings

Are there any user-facing changes?

Yes. Negative logarithm inputs now return a domain error instead of NaN.

[kumarUjjawal]

@puneetdixit200 Isn't this the same PR you opened previously which already had another PR.

I would appreciate it if you look at the linked pr in the issue before opening a new one.

[puneetdixit200]

Closing this as a duplicate of #22276. I missed the existing linked PR when reopening this scope; sorry for the noise.