DVX-624: Adds ability to search for source-synced tags by assigned value

[Aryamanz29]

Other changes

• Added initial support for Span, SpanNear, SpanWithin and SpanTerm queries for textual fields.

Sample snippet

from pyatlan.client.atlan import AtlanClient
from pyatlan.model.assets.core.asset import Asset
from pyatlan.model.fluent_search import CompoundQuery, FluentSearch

client = AtlanClient()

tables = (
    FluentSearch()
    .select()
    .where(Asset.TYPE_NAME.eq("Table"))
    .where(CompoundQuery.tagged_with_value("Confidential", "Highly Restricted"))
).execute(client=client)

print(tables.count)