feat: add C implementation for lognormal distribution logpdf

[DeshDeepakKant]

Resolves #3751 .

Description

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This pull request:

• {{TODO: add description describing what this pull request does}}

Related Issues

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This pull request:

• resolves [RFC]: Add C implementation for @stdlib/stats/base/dists/lognormal/logpdf #3751

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/lognormal/logpdf	$\color{green}318/318$ $\color{green}+100.00\%$	$\color{green}23/23$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}318/318$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

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