feat(node): add decloudnodeslab snapshot provider

[andy108369]

based on #290

[andy108369]

@Dimokus88 unfortunately it doesn't work as-is:

...
+ apt -y --no-install-recommends install aria2 lz4 liblz4-tool wget
+ case "$SNAPSHOT_PROVIDER" in
+ SNAPSHOT_URL=https://akash.declab.pro/latest.tar.lz4
+ aria2c --out=snapshot.tar.lz4 --check-certificate=false --max-tries=99 --retry-wait=5 --always-resume=true --max-file-not-found=99 --conditional-get=true -s 8 -x 8 -k 1M -j 1 https://akash.declab.pro/latest.tar.lz4

09/26 09:43:05 [NOTICE] Downloading 1 item(s)
[#9c7949 5.3MiB/8.9GiB(0%) CN:8 DL:11MiB ETA:13m]
[#9c7949 36MiB/8.9GiB(0%) CN:8 DL:24MiB ETA:6m5s]
...
...
[#9c7949 8.8GiB/8.9GiB(98%) CN:8 DL:33MiB ETA:4s]
[#9c7949 8.8GiB/8.9GiB(98%) CN:8 DL:33MiB ETA:3s]
[#9c7949 8.8GiB/8.9GiB(98%) CN:8 DL:33MiB ETA:2s]
[#9c7949 8.8GiB/8.9GiB(99%) CN:8 DL:32MiB ETA:1s]
[#9c7949 8.9GiB/8.9GiB(99%) CN:8 DL:32MiB]
[#9c7949 8.9GiB/8.9GiB(99%) CN:4 DL:32MiB]

09/26 09:47:54 [NOTICE] Download complete: /root/.akash/data/snapshot.tar.lz4

Download Results:
gid   |stat|avg speed  |path/URI
======+====+===========+=======================================================
9c7949|OK  |    31MiB/s|/root/.akash/data/snapshot.tar.lz4

Status Legend:
(OK):download completed.
+ tar -xf snapshot.tar -C /root/.akash
tar: snapshot.tar: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
+ rm -rf snapshot.tar
+ [[ false == \t\r\u\e ]]