* chore (.gitignore): ignore .vscode folder and any *.code-workspace files

* feat (--version): add support for printing version via the --version flag

* feat (--display-subscriptions-column): new flag

* feat (version): bump to 0.5.3 (old was: 0.5.2)

* fix (csv output): when emitting csv output via '-o' the subs will be printed separated by whitespace chars instead of ',' because the ',' is frequently reserved to separate entire csv-columns in the resulting output

* fix (nats-top.go): fix a bug which was causing the SUBSCRIPTIONS column to not be delimiter-separator when the --display-subscriptions-column flag would be used in conjunction with -o

Co-authored-by: Kyriakos Sidiropoulos <kyriakos.sidiropoulos@laerdal.com>

* feat (display-subscriptions-column): add the '-u' shorthand for the long option '--display-subscriptions-column' and updated the README.md file accordingly to mention these new options

Co-authored-by: Kyriakos Sidiropoulos <kyriakos.sidiropoulos@laerdal.com>

Signed-off-by: Waldemar Quevedo <wally@nats.io>

By checking the code there were some security vulnerabities present in
the net-tools binary such has:

usr/local/bin/nats-top (gobinary)

Total: 3 (UNKNOWN: 1, LOW: 0, MEDIUM: 1, HIGH: 1, CRITICAL: 0)

┌─────────────────────┬─────────────────────┬──────────┬────────────────────────────────────┬───────────────────────────────────┬────────────────────────────────────────────────────────────┐
│       Library       │    Vulnerability    │ Severity │         Installed Version          │           Fixed Version           │                           Title                            │
├─────────────────────┼─────────────────────┼──────────┼────────────────────────────────────┼───────────────────────────────────┼────────────────────────────────────────────────────────────┤
│ golang.org/x/crypto │ CVE-2022-27191      │ HIGH     │ v0.0.0-20220112180741-5e0467b6c7ce │ 0.0.0-20220314234659-1baeb1ce4c0b │ golang: crash in a golang.org/x/crypto/ssh server          │
│                     │                     │          │                                    │                                   │ https://avd.aquasec.com/nvd/cve-2022-27191                 │
│                     ├─────────────────────┼──────────┤                                    │                                   ├────────────────────────────────────────────────────────────┤
│                     │ GHSA-8c26-wmh5-6g9v │ UNKNOWN  │                                    │                                   │ Attackers can cause a crash in SSH servers when the server │
│                     │                     │          │                                    │                                   │ has...                                                     │
│                     │                     │          │                                    │                                   │ GHSA-8c26-wmh5-6g9v          │
├─────────────────────┼─────────────────────┼──────────┼────────────────────────────────────┼───────────────────────────────────┼────────────────────────────────────────────────────────────┤
│ golang.org/x/sys    │ CVE-2022-29526      │ MEDIUM   │ v0.0.0-20220111092808-5a964db01320 │ 0.0.0-20220412211240-33da011f77ad │ golang: syscall: faccessat checks wrong group              │
│                     │                     │          │                                    │                                   │ https://avd.aquasec.com/nvd/cve-2022-29526                 │
└─────────────────────┴─────────────────────┴──────────┴────────────────────────────────────┴───────────────────────────────────┴────────────────────────────────────────────────────────────┘

These results come from Trivy from the nats-box image. Upgrading the
packages fixed inner dependencies and these crypto and sys packages were
upgraded to the latest version.