[libraries] Refactor PSCID configuration to use template strings

[HachemJ]

Brief summary of changes

This PR starts implementing the identifier template strings proposed in the following GitHub Discussion #9036.

It updates the existing PSCID structure configuration to support template strings while keeping the current identifier generation behaviour unchanged.

The existing Candidate tests were updated to work with the new structure, and a new test suite was added for PSCIDGenerator to cover the different template options and generation cases.

Testing instructions (if applicable)

<!-- Sequential numeric (default format) -->
<PSCID>
    <generation>sequential</generation>
    <structure>TEST-{SEQUENCE:4}</structure>
</PSCID>

Expected : TEST-0000

<!-- Sequential numeric boundary -->
<PSCID>
    <generation>sequential</generation>
    <structure>TEST-{SEQUENCE:4}</structure>
</PSCID>

Existing PSCID : TEST-0099
Expected : TEST-0100

<!-- Sequential alpha (default minimum) -->
<PSCID>
    <generation>sequential</generation>
    <structure>ALPHA-{SEQUENCE:4,FORMAT:alpha}</structure>
</PSCID>

Expected : ALPHA-AAAA

<!-- Sequential alpha boundary -->
<PSCID>
    <generation>sequential</generation>
    <structure>ALPHA-{SEQUENCE:4,FORMAT:alpha}</structure>
</PSCID>

Existing PSCID : ALPHA-AAAZ
Expected : ALPHA-AABA

<!-- Sequential alpha near default maximum -->
<PSCID>
    <generation>sequential</generation>
    <structure>ALPHA-{SEQUENCE:4,FORMAT:alpha}</structure>
</PSCID>

Existing PSCID : ALPHA-ZZZX
Expected : ALPHA-ZZZY

<!-- Sequential alpha default maximum exceeded -->
<PSCID>
    <generation>sequential</generation>
    <structure>ALPHA-{SEQUENCE:4,FORMAT:alpha}</structure>
</PSCID>

Existing PSCID : ALPHA-ZZZY
Expected : Error!
Cannot create new identifier because all valid identifiers are in use!

<!-- Random numeric -->
<PSCID>
    <generation>random</generation>
    <structure>RAND-{RANDOM:4,FORMAT:numeric}</structure>
</PSCID>

Expected : RAND-#### where # is a random digit from 0 to 9.
e.g. : RAND-3966, RAND-2971, RAND-0427

<!-- Random alpha -->
<PSCID>
    <generation>random</generation>
    <structure>RANDALPHA-{RANDOM:4,FORMAT:alpha}</structure>
</PSCID>

Expected : RANDALPHA-XXXX where X is a random letter from A-Z.
e.g. : RANDALPHA-JRMK, RANDALPHA-ZJZP, RANDALPHA-IZCH

<!-- Random alphanumeric -->
<PSCID>
    <generation>random</generation>
    <structure>RANDALPHANUM-{RANDOM:4,FORMAT:alphanumeric}</structure>
</PSCID>

Expected : RANDALPHANUM-XXXX where X is a random character from 0-9 or A-Z.
e.g. : RANDALPHANUM-KZLK, RANDALPHANUM-0U0W, RANDALPHANUM-1234

<!-- Numeric padding -->
<PSCID>
    <generation>sequential</generation>
    <structure>PAD-{SEQUENCE:4,FORMAT:numeric,PADDING:2,MIN:1}</structure>
</PSCID>

Expected : PAD-2221

<!-- Invalid numeric padding -->
<PSCID>
    <generation>sequential</generation>
    <structure>PAD-{SEQUENCE:4,FORMAT:numeric,PADDING:X,MIN:1}</structure>
</PSCID>

Expected : Error!
Padding character must be part of the configured alphabet.

<!-- Alpha padding -->
<PSCID>
    <generation>sequential</generation>
    <structure>PADALPHA-{SEQUENCE:4,FORMAT:alpha,PADDING:X,MIN:A}</structure>
</PSCID>

Expected : PADALPHA-XXXA

<!-- MIN/MAX -->
<PSCID>
    <generation>sequential</generation>
    <structure>MAXTEST-{SEQUENCE:4,FORMAT:numeric,MIN:1,MAX:3}</structure>
</PSCID>

Existing PSCIDs : MAXTEST-0001, MAXTEST-0002
Expected : Error!
Cannot create new identifier because all valid identifiers are in use!

<!-- Site alias -->
<PSCID>
    <generation>sequential</generation>
    <structure>{SITE:ALIAS}{SEQUENCE:4,FORMAT:numeric}</structure>
</PSCID>

Expected (Site: Data Coordinating Center): DCC0703 -> DCC0704 
(Site: Montreal): MTL0166

<!-- Project alias -->
<PSCID>
    <generation>sequential</generation>
    <structure>{PROJECT:ALIAS}{SEQUENCE:4,FORMAT:numeric}</structure>
</PSCID>

Expected (Project: Pumpernickel): PUMP0000 -> PUMP0001
(Project: DCP): DCP0000

<!-- Generation mismatch: sequential with RANDOM template -->
<PSCID>
    <generation>sequential</generation>
    <structure>MISMATCH-{RANDOM:4,FORMAT:numeric}</structure>
</PSCID>

Expected : Error!
Generation methods do not match.

<!-- Generation mismatch: random with SEQUENCE template -->
<PSCID>
    <generation>random</generation>
    <structure>MISMATCH-{SEQUENCE:4,FORMAT:numeric}</structure>
</PSCID>

Expected : Error!
Generation methods do not match.