Add precision property to result and reportingDescriptor

[adityasharad]

Closes #611.
Proposal for SARIF 2.2.

Open questions for review:

• Should this be in reportingConfiguration too? It doesn't seem like a property of the tool runtime, so I left it out.
• Should we specify -1.0 as the default value like rank? That seemed odd to me, so I kept the default as absent/omitted.

[sthagen]

@Torc-Charles-Wilson please kindly review.

[adityasharad]

Notes from meeting

• mention 'floating point' numbers
• encourage limiting precision of decimals
• mention that it's allowed to change between versions of a tool/component

[sthagen]

My feedback on:

Open questions for review:

• Should this be in reportingConfiguration too? It doesn't seem like a property of the tool runtime, so I left it out.

Seconded.

• Should we specify -1.0 as the default value like rank? That seemed odd to me, so I kept the default as absent/omitted.

Seconded.

[sthagen]

Changed target to branch oasis-tcs/sarif-spec/editor-revision-2026-03-05 as usual and discussed during the TC meeting 2026-03-05.

[sthagen]

We need to merge PR # 767 first into this source branch and then both change-sets combined enter the oasis-tcs/sarif-spec/editor-revision-2026-03-05 branch.