Update certificate "report" format to indicate SANs list count for SANs entries line

[atc0005]

Current output from running lscert against go.dev:

$ lscert go.dev


======================
CERTIFICATES | SUMMARY
======================

- OK: 3 certs retrieved for service running on go.dev (216.239.32.21) at port 443 using host value "go.dev"
- OK: Hostname validation using value "go.dev" successful for leaf certificate
- OK: SANs List validation ignored: 0 SANs entries specified, 1 SANs entries on leaf cert [0 EXPECTED, 0 MISSING, 0 UNEXPECTED]
- OK: Expiration validation successful: leaf cert "go.dev" expires next with 73d 15h remaining (until 2023-10-16 04:54:45 +0000 UTC) [EXPIRED: 0, EXPIRING: 0, OK: 3]


============================
CERTIFICATES | CHAIN DETAILS
============================

Certificate 1 of 3 (leaf):
        Name: CN=go.dev
        SANs entries: [go.dev]
        Issuer: CN=GTS CA 1D4,O=Google Trust Services LLC,C=US
        Serial: 31:29:1A:D6:FB:1C:DA:63:0A:28:30:F3:E0:21:A6:53
        Issued On: 2023-07-18 04:12:38 +0000 UTC
        Expiration: 2023-10-16 04:54:45 +0000 UTC
        Status: [OK] 73d 15h remaining

Certificate 2 of 3 (intermediate):
        Name: CN=GTS CA 1D4,O=Google Trust Services LLC,C=US
        SANs entries: []
        Issuer: CN=GTS Root R1,O=Google Trust Services LLC,C=US
        Serial: 02:00:8E:B2:02:33:36:65:8B:64:CD:DB:9B
        Issued On: 2020-08-13 00:00:42 +0000 UTC
        Expiration: 2027-09-30 00:00:42 +0000 UTC
        Status: [OK] 1518d 10h remaining

Certificate 3 of 3 (intermediate):
        Name: CN=GTS Root R1,O=Google Trust Services LLC,C=US
        SANs entries: []
        Issuer: CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE
        Serial: 77:BD:0D:6C:DB:36:F9:1A:EA:21:0F:C4:F0:58:D3:0D
        Issued On: 2020-06-19 00:00:42 +0000 UTC
        Expiration: 2028-01-28 00:00:42 +0000 UTC
        Status: [OK] 1638d 10h remaining

Proposed change:

- SANs entries: [go.dev]
+ SANs entries (1): [go.dev] 

Offhand I don't recall whether certsum provides SANs list indicators.