feat(sql): log and sqrt implementations

[bluestreak01]

thanks to @mrecht, this is essentially a clean up of Mark's PR #772

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6 out of 7 committers have signed the CLA.

✅ patrickSpaceSurfer
✅ mrecht
✅ ideoma
✅ mpsq
✅ bluestreak01
✅ piotrrzysko
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[ideoma]

[PR Coverage check]

😍 pass : 6 / 6 (100.00%)

file detail

	path	covered line	new line	coverage
🔵	io/questdb/griffin/engine/functions/math/LogDoubleFunctionFactory.java	3	3	100.00%
🔵	io/questdb/griffin/engine/functions/math/SqrtDoubleFunctionFactory.java	3	3	100.00%