TSQL: Allow for multiple variables DECLAREd in the same statement

[jpers36]

The DECLARE segment was not properly parsing multiple variable declarations. This change moves AnyNumber to the correct location with the correct content. Added example to an existing test case.

[codecov]

Codecov Report

Merging #1651 (3ff6f3c) into main (a118069) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main     #1651   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          133       133           
  Lines         9250      9250           
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  Hits          9250      9250           

Impacted Files	Coverage Δ
src/sqlfluff/dialects/dialect_tsql.py	100.00% <ø> (ø)

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[tunetheweb]

Approved.

In theory, this should be possible with Delimited(...) but tried it and it won't work. I suspect because of #1366

So OK to go with this alternative for now.

[jpers36]

@tunetheweb since we can't separate the statement segments in TSQL using a delimiter, any effort to use Delimited() ends up grabbing all elements up through the next delimiter if it exists in a following statement. So the last element gets misparsed to include part of the following segment or more.