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T6442: CGNAT add log for address allocation
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Add the configuration command to log current CGNAT allocation
set nat cgnat log-allocation
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Fix external address/port allocation for CGN.
It fixes some cases where external address/ports can be allocated again
to another user.
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Fix the bug where address external alocation was not rely on sequences
of the external IP addresses (if set)
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Allow to set multiple CGNAT internal pools
```
set nat cgnat pool internal int-01 range '100.64.0.0/28'
set nat cgnat pool internal int-01 range '100.64.222.11-100.64.222.14'
```
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As PoC for CGNAT had a hard limit of using only one translation
rule for one internal pool.
Drop this limit and extend the usage number of the rules.
```
set nat cgnat rule 100 source pool 'int-01'
set nat cgnat rule 100 translation pool 'ext-01'
set nat cgnat rule 120 source pool 'vyos-int-02'
set nat cgnat rule 120 translation pool 'vyos-ext-02'
```
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T6351: CGNAT add verification if the pool exists
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Add verification if the external/internal pools are exists before we
can use them in the source and translation rules
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Add PoC for generating CGNAT rules
https://datatracker.ietf.org/doc/html/rfc6888
Not all requirements are implemented, but some of them.
Implemented:
REQ-2
```
A CGN MUST have a default "IP address pooling" behavior of "Paired"
CGN must use the same external IP
address mapping for all sessions associated with the same internal
IP address, be they TCP, UDP, ICMP, something else, or a mix of
different protocols.
```
REQ-3
```
The CGN function SHOULD NOT have any limitations on the size
or the contiguity of the external address pool
```
REQ-4
```
A CGN MUST support limiting the number of external ports (or,
equivalently, "identifiers" for ICMP) that are assigned per
subscriber
```
CLI:
```
set nat cgnat pool external ext1 external-port-range '1024-65535'
set nat cgnat pool external ext1 per-user-limit port '1000'
set nat cgnat pool external ext1 range 192.0.2.222/32
set nat cgnat pool internal int1 range '100.64.0.0/28'
set nat cgnat rule 10 source pool 'int1'
set nat cgnat rule 10 translation pool 'ext1'
```
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