modules/ztd: surface metrics for zstd_dec

[proppy]

Spitting this from #1857, as it's likely to require to be implemented separelty.

It would be nice to surface metrics for the //xls/modules/zstd:zstd_dec_dslx block:

• area estimate: post-synthesis, post-pnr
• algorithm throughput estimate: through block IR (and maybe verilog?) simulation across a representative corpus of zstd frames.
• algorithm delay independent of the size or type of the ztd frame.

Ideally those would be surfaced in the summary of workflow runs of PRs affecting the modules/zstd.

[proppy]

flagging @mikesinouye's comment here #2230 (comment) about investigating why the openroad runs are timeout'ing.